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Radiation ‘sniffer plane’ over Europe

questionA radiation ‘sniffer plane’ is reportedly searching for the source of a cloud of nuclear isotopes floating across Europe, news.com.au FEBRUARY 23, 2017 A CLOUD of radioactive particles is floating across Europe — and no one knows where it came from.  First detected in mid-January, spikes in the level of a radioactive isotope called Iodine-131, have been recorded all the way from Norway to Spain.

February 25, 2017 Posted by | environment, EUROPE, radiation | Leave a comment

‘The cancer rates have surged enormously due to high levels of radiation’

 

By Christopher Busby

The US Nuclear Regulatory Commission has killed a study aimed at finding out whether nuclear reactors pose cancer risks to nearby residents. According to the Los Angeles Daily News, the decision was made due to the high cost of the probe and doubts that it would prove effective. The project in question, which is worth eight million dollars, would have examined seven nuclear facilities all across the country. The new investigation was supposed to have reassured Americans that it was not dangerous healthwise to reside near a nuclear power plant. A similar study, coming to the same conclusion, was last conducted almost 30 years ago. Several recent European tests revealed rather disturbing links between cancer and minors living close to nuclear facilities. Radio Sputnik discussed the issue with Christopher Busby, British scientist known for his theories about the negative health effects of very low-dose ionising radiation. Mr. Busby is a director of Green Audit Limited and scientific advisor to the Low Level Radiation Campaign.

https://soundcloud.com/radiosputnik/the-cancer-rates-have-surged-enormously-due-to-high-levels-of-radiation-christopher-busby

February 9, 2017 Posted by | radiation | , , | Leave a comment

Genetic radiation risks: a neglected topic in the low dose debate.

Abstract

Objectives

To investigate the accuracy and scientific validity of the current very low risk factor for hereditary diseases in humans following exposures to ionizing radiation adopted by the United Nations Scientific Committee on the Effects of Atomic Radiation and the International Commission on Radiological Protection. The value is based on experiments on mice due to reportedly absent effects in the Japanese atomic bomb (Abomb) survivors.

Methods

To review the published evidence for heritable effects after ionising radiation exposures particularly, but not restricted to, populations exposed to contamination from the Chernobyl accident and from atmospheric nuclear test fallout. To make a compilation of findings about early deaths, congenital malformations, Down’s syndrome, cancer and other genetic effects observed in humans after the exposure of the parents. To also examine more closely the evidence from the Japanese A-bomb epidemiology and discuss its scientific validity.

Results

Nearly all types of hereditary defects were found at doses as low as one to 10 mSv. We discuss the clash between the current risk model and these observations on the basis of biological mechanism and assumptions about linear relationships between dose and effect in neonatal and foetal epidemiology. The evidence supports a dose response relationship which is non-linear and is either biphasic or supralinear (hogs-back) and largely either saturates or falls above 10 mSv.

Conclusions

We conclude that the current risk model for heritable effects of radiation is unsafe. The dose response relationship is non-linear with the greatest effects at the lowest doses. Using Chernobyl data we derive an excess relative risk for all malformations of 1.0 per 10 mSv cumulative dose. The safety of the Japanese A-bomb epidemiology is argued to be both scientifically and philosophically questionable owing to errors in the choice of control groups, omission of internal exposure effects and assumptions about linear dose response.

Keywords: Congenital malformation, Down´s syndrome, Environmental radioactivity, Internal radiation, Low level effects, Sex-ratio, Still birth

Introduction

The most serious effects of ionizing radiation–hereditary defects in the descendants of exposed parents–had been already detected in the 1920s by Herman Joseph Muller. He exposed fruit flies–drosophila–to X-rays and found malformations and other disorders in the following generations. He concluded from his investigations that low dose exposure, and therefore even natural background radiation, is mutagenic and there is no harmless dose range for heritable effects or for cancer induction. His work was honoured by the Nobel Prize for medicine in 1946. In the 1950s Muller warned about the effects on the human genetic pool caused by the production of low level radioactive contamination from atmospheric tests [1].

The International Commission on Radiological Protection (ICRP) recently decreased its risk estimate for heritable damage in 2007 [2,3]. Its Detriment Adjusted Nominal Risk Coefficient for radiation heritable effects in an exposed population was reduced from the previous 1990 value of 1.3% Sv-1 to 0.2% Sv-1 a greater than 6-fold reduction. The ICRP approach is based on a linear relation between dose and end-point, measured as heritable disease at or before birth. Evidence and arguments which we will present suggest that this linear assumption is invalid and that the ICRP value is unsafe when applied to the chronic low dose internal exposure range.

The belief that heritable consequences of radiation were negligible followed from studies of the Japanese survivors of the atomic bomb (A-bomb) explosions in Hiroshima and Nagasaki in 1945. The American-Japanese Institute in Hiroshima, Atomic Bomb Casualty Commission (ABCC), did not apparently find mutations in the descendants of the survivors. Therefore the ICRP derive its current risk figure from experiments in mice. The result corresponds to the evaluation by the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR committee) [4].

We will show that the current model for genetic effects of exposure is unsound and we present a more realistic one based on data. We will begin by pointing to some serious problems with the ABCC studies of genetic effects in the A-bomb survivors. These may be classed under four Error Types.

Type 1. The dose response problem. For genetic damage, increasing dose will not linearly increase effects since at high doses there will be sterility or fetal loss [5].

Type 2. The external/internal problem. The dose of interest is the energy delivered to the germ cells and their precursors. This may be much higher for internal radionuclides with affinity for DNA (strontium-90 [Sr-90], barium-140, uranium) [6].

Type 3. The philosophical method problem. If data is interpreted though a particular scientific model, evidence which cannot fit the model will be ignored, dismissed or invisible [7,8].

Type 4. Bias in the analysis of or presentation of data from the ABCC results. There have been a number of serious criticisms of the ABCC and later studies of cancer effects. The genetic studies were criticised by De Bellefeuille [9] who demonstrated the existence of significant genetic effects including sex-ratio and malformations which had been “lost” through the choice of analysis. However, De Bellefeuille’s observations were ignored by the risk agencies. The issue will be returned to in the discussion section.

Together these raise major doubts over the belief, expressed in ICRP103, Appendix B.2.01 [2], that “Radiation induced heritable disease has not been demonstrated in human populations.”

Effects in populations exposed to Chernobyl fallout are excluded by the official committees, which claim that doses are too low to generate statistically observable increases (the philosophical method problem: Error Type 3). This, however, is certainly wrong, because we know from many studies of chromosome aberrations, either that the doses calculated by UNSCEAR are much too low or that there is an enhanced radiobiological effectiveness (RBE) in the type of internal exposures or chronic delivery received by the Chernobyl groups. In other words, the biological or genetic damage from unit internal dose e.g., from a radioactive atom bound to DNA is far greater than for the same dose delivered externally. This is Error Type 2: internal/external problem. The doses upon which the ICRP risks are based, either from humans or mice, are external doses. There are significant issues regarding the equivalence for causing genetic damage of internal and external dose calculations [6]. Internal exposure to uranium by inhalation, for example, has been associated with significantly high genotoxicity resulting in anomalously high excess levels of chromosome damage and birth defects in a number of different groups [10]. Uranium binds to DNA, a fact that has been known since the 1960s [1113]. Other group II calcium mimics and DNA seekers include the nuclide Sr-90 which causes significant genetic effects [1417]. All epidemiological studies of radiation and health which define risk factors have been subject of this Error Type 2: external/internal problem, and have generally also defined risk in terms of cumulative integrated equivalent dose, and so real effects have been ignored or dismissed, the Error Type 3: philosophical problem.

Findings in Children Born After the Chernobyl Accident and in Kazakhstan

We previously published findings about fetal deaths, perinatal mortality and congenital malformations (CM) after Chernobyl [18]. Table 1 shows results for CM after Chernobyl. These appeared not only in the area of the exploded reactor but also in Turkey, Bulgaria, Croatia, and Germany. Our criteria for inclusion of this evidence was originally to present only observations which disagreed with the current ICRP/UNSCEAR paradigm but following questions by a reviewer we include discussion of one of the few studies with contemporary data which claims to have shown that there were no measurable heritable effects [19].

Table 1. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4870760/table/t1-eht-31-e2016001/

Increase of congenital malformations after exposure by the Chernobyl accident

The EUROCAT Europe-wide Study

The study of Dolk and Nichols [19] is widely cited as evidence for no effect. The authors examined Down’s syndrome, neural tube defects (NTD), microcephaly, hydrocephaly, anopthalmos and congenital cataract in 16 EUROCAT registers. There were 231401 births in the areas in 1986. The 16 registries were divided into three groups of high (200 to 800 μSv), medium (97 to 190 μSv) and low (29 to 55 μSv). Three comparison cohort periods were defined as E (conception May 1986), T (conception May 1986 to April 1987 contains E), and C (control: conception May 1987 to April 1989). Authors concluded “no evidence of a generalised detectable increase in the prevalence of congenital anomalies in the first month or first year following Chernobyl.” But the choice of the cohort periods for a study of “heritable effects” is interesting. On the basis of whole body monitoring results, genetic damage to the germ cells from internal exposures will have continued well into the control period C and damage will have been cumulative [44]. We have reanalysed their data for combined NTD hydrocephaly, microcephaly and anopthalmia in all their exposure groups using their periods. A test of T vs. C cohorts showed a significant effect with odds ratio (OR) of 1.20 (95% confidence interval [CI], 1.02 to 1.4; p=0.014). This was apparent in the test of E vs. C though the numbers were smaller. However, there was no increasing monotonic relation between assumed “dose” category and effect and this clearly influenced the authors’ conclusions. This is the common response to the finding of high risks at low doses and represents a good example of the Error Type 1 referred to above. It appears that the results actually show an increased risk if we combine all the exposure levels.

Chernobyl Effects in Belarus

Belarus received most contamination from Chernobyl. A central registry for CM existed from 1979 and rates of CM before and after the Chernobyl accident could thus be compared. A number of studies are listed in Table 1. Comparison of legal abortuses in 1982 to 1985 and 1987 to 1994 showed combined CM increases of 81%, 49%, and 43% in regions of high (>555 kBq/m2), medium (>37 kBq/m2), and low (<37 kBq/m2) contamination, the effect being significant at the 0.05 level in all three [22]. The genetic origin is confirmed in those anomalies which are combined with a recognized mutation that is not present in either of the parents [18].

A study [23] confirmed the CM excess in the Strict Registration of Malformations System finding 86% increase in 1987 to 1996 vs. 1982 to 1985 (high contamination) and 59% (control regions) (p<0.05). The same authors reported significant excess chromosome aberrations of dicentric and centric rings rates of 0.39±0.09% (n=91) in Gomel and Mogilev (>555 kBq/m2) compared with a control region of Minsk, Grodno and Novopolotsk (<37 kBq/m2) (n=118; CM=0.09±0.04) [23].

To 2004 there was no decrease in these rates [45]. The authors think these effects are genetically induced because it is not plausible that doses in pregnant females rose in the period of decreasing environmental contamination and decreasing food contamination after the accident. A Belarussian-Israeli group [46] found the following increased polygenetic disease rates in children of Chernobyl- exposed parents: hematological diseases (6-fold), endocrine diseases (2-fold), diseases of digestive organs (1.7-fold).

A 1994 study compared Gomel (high exposure) with Vitebsk (presumed low exposure) for mortality in children zero to four finding absolute CM rates of 4.1% vs. 3%, respectively [24]. Savchenko [25] writing for the United Nations reported frequency of CM in regions of Gomel between 1982 to 1985 and 1987 to 1989 ranging from 170% in Dobrush to 680% in Chechersk.

Petrova et al. [27] compared two high and two low contaminated regions of Belarus for a number of indicators of pregnancy outcome and child health. For CM, before and after Chernobyl increases for all CM were: Gomel 150%>Mogilev 130%>Brest 120%>Vitebsk 110%, the rank of their contamination levels. Kulakov et al. [26] examined 688 pregnancies and 7000 births in Chechersky (Gomel, Belarus) and Polessky (Kiev, Ukraine). Sharp reductions in birth rates in both regions after Chernobyl were ascribed partly to abortions. High perinatal mortality was ascribed partly to congenital malformations. Incidence increased by a factor of two following the accident for congenital heart disease, esophageal atresia, anencephaly, hydrocephaly and multiple malformations. Total number of neonatal disorders increased in Polessky (Ukraine) from 1983 to 1985 to 1986 to 1990 from 6.81 to 21.32 (313%) and in Chechersky from 5.15 to 10.49 [26].

Chernobyl Effects in Ukraine

The studies by Wertelecki and colleagues [29,30] were valuable for quantifying the effects. The Pripyat region of Ukraine on the border of Belarus was significantly contaminated. Populations are dependent on local produce. Internal contamination was quantified for two groups, a high and lower dose group by whole body monitoring for caesium-137 (Cs-137). In addition, local produce was analysed for both Cs-137 and the DNA seeking Sr-90. The Sr-90/Cs-137 ratio was between 0.5 and two, so Sr-90 (with its DNA affinity and anomalous RBE) represented a significant internal exposure.

Other Reports of Chernobyl Effects on Birth Defects; Soviet Nuclear Test Site

Down´s syndrome as a certain genetic effect increased in several contaminated European countries [18,48]. An example is shown in Figure 1. In West Berlin, which was a kind of closed island at that time, the geneticist Sperling registered a sharp and significant increase in cases exactly nine months after the accident, also in Belarus [49]. UNSCEAR [4,20] dismissed these findings (and similar reports from Scotland and Sweden) on the basis that the doses were “below background.” The EUROCAT combined registry study [19] did not find an increase in Down’s syndrome, neither in the authors’ analysis nor in our reanalysis. Other evidence is presented in Table 1 of increased CM rates after Chernobyl in Germany, Turkey, Croatia and Bulgaria [21,3237,50].

 

eht-31-e2016001f1.jpg

Figure 1.

Down’s syndrome before and after the Chernobyl accident (A) West Berlin and (B) Belarus. From Scherb H, et al. Naturwiss Rundsch 2011;64(5):229-239, with permission from Stuttgart [47].

Congenital effects were found near the former Soviet nuclear test site in Kazakhstan near Semipalatinsk. Sviatova et al. [51] studied CM in three generations of inhabitants, investigating births between 1967 and 1997. They found significantly increased rates of CM combined, including Down’s syndrome, microcephaly and multiple malformations in the same individual.

 

Hereditary Effects in Children of Exposed Mothers

If a population is exposed, genetic effects will occur in the gonads of mothers as well as of fathers. A German investigation of occupationally exposed females showed a 3.2-fold significant increase in congenital abnormalities, including malformations, in offspring [52]. The authors interpret the effect as generated in utero but do not prove such a connection. In our opinion, this appears to be improbable given the short sensitive phase in pregnancy and the ban on pregnant females working in high risk environments.

The findings confirm early results in the Department of Medical Genetics of Montreal Children’s Hospital where the genetic effects of diagnostic X-rays were investigated [53]. The author observed the offspring of mothers who had been treated in childhood for congenital hip dysplasia since 1925 and were X-rayed for several times in the pelvic region. The ovarian dose was estimated to lie between 60 mSv to 200 mSv. In 201 living births of these females there were 15 individuals with severe malformations and other congenital distortions or Down’s syndrome and 11 cases with other abnormalities (all congenital abnormalities 12.9%) while the control group showed less than half of this rate. The latter was chosen from a large group of descendants where the parents were unexposed siblings of the study group.

Taken together with other evidence from sex-ratio (discussed below) these studies indicate that hereditary effects exist in the children of exposed mothers.

Findings in the Descendants of Occupationally Exposed Men Including Nuclear Test Veterans

Congenital Malformations

Studies in children of exposed men where the mothers were not exposed will show definite hereditary effects. A compilation of results for CM in offspring of exposed fathers is given in Table 2.

Table 2. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4870760/table/t2-eht-31-e2016001/

Congenital anomalies, especially malformations, in descendants (1st generationa) of occupationally exposed men

The anomalies seen in the descendants of Chernobyl liquidators (Nos. 5-7) also indicate unexpectedly high radiation sensitivity.

Three studies of nuclear test veterans have shown large increases in congenital effects in children and one study has found similar levels of congenital conditions in the grandchildren (Nos. 8-10). The British carried out nuclear weapon tests and activities in Australia (Maralinga) and Christmas Island in the Pacific between 1952 and 1967. More than 20000 young national servicemen and other military personnel were stationed at the test sites. The sites were contaminated with fission fallout and nanoparticles of uranium and plutonium from the weapons, tritium and carbon-14. Urquhart [61] analysed data in children from 1147 veteran families. Two hundred and thirty-three out of them had illnesses or defects (cancer, malformations, mental retardation) that could have a genetic origin: one in five families. They registered a 7:1 rate of abnormal children conceived before the tests vs. those conceived after the tests.

Two further studies of the offspring of a group of veterans have been published. Roff [62] carried out a questionnaire study of members of the British Nuclear Test Veteran Association (BNTVA) and reported excess rates of cardiovascular disorders, spina bifida, hydrocephalus and hip deformities. Busby and de Messieres [63] examined a different sample of the BNTVA, employed controls and compared with the European EUROCAT rates. Based on 605 veteran children and 749 grandchildren compared with 311 control children and 408 control grandchildren there were significant excess levels of miscarriages, stillbirths, infant mortality and congenital illnesses in the veterans’ children relative both to control children and expected numbers. There were 105 miscarriages in veteran’s wives compared with 18 in controls (OR, 2.75; 95% CI, 1.56 to 4.91; p<0.001). There were 16 stillbirths; three in controls (OR, 2.70; 95% CI, 0.73 to 11.72; p=0.13). Perinatal mortality OR was 4.3 (95% CI, 1.22 to 17.9; p=0.01) on 25 deaths in veteran children. Fifty-seven veteran children had congenital conditions vs. three control children (OR, 9.77; 95% CI, 2.92 to 39.3; p<0.001) these rates being also about eight times those expected on the basis of UK EUROCAT data for 1980 to 2000. For grandchildren similar levels of congenital illness were reported with 46 veteran grandchildren compared with three controls (OR, 8.35; 95% CI, 2.48 to 33.8; p<0.001).

Cancer and Leukemia

In 1984, an exceptionally high level of leukaemia cases in children and juveniles was reported in Seascale, near the nuclear reprocessing plant in Sellafield in Cumbria, UK. The authors explained this as a hereditary effect, because the fathers of the patients had worked in the plant [64]. The authorities argued that the doses were too low. The effect, however, had been described in principle already in experimental studies [65], and also after X-ray diagnostic exposures (Table 3). A significant number of other child leukemia and cancer studies have been carried out and are listed in Table 3.

Table 3. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4870760/table/t3-eht-31-e2016001/

Cancer in children after preconceptional low-dose exposure of parents

The research of Hicks et al. [66] concerned exposed servicemen (Table 3). McKinney et al. [67] found a 3.2-fold increase in leukaemia and lymphomas in children of occupationally exposed men in three British regions in a case-control study.

Sex-ratio and X-linked Lethal Factors

Normally, it is not possible to study how many inseminated oocytes (zygotes) will be aborted after irradiation of the gonadal cells in humans. But it is observed that males who were exposed have fewer daughters than sons i.e., the male/female sex-ratio increases with dose.

Gene mutations may be responsible for the death of the zygote and will also occur in the sex chromosomes where they will predominantly affect the greater X-chromosome which can only be transmitted to a daughter. A dominant lethal factor will then lead to the death of the female zygote. Recessive lethal factors in the X-chromosome are much more frequent than dominant ones [74]. They affect only female births.

An impressive result was obtained in workers of the British nuclear fuel reprocessing plant at Sellafield in West Cumbria [75]. The county sex-ratio was 1055 boys/1000 girls, the normal value. For the children of fathers employed at Sellafield the ratio was 1094. For those with recorded doses greater than 10 mSv in the 90 days preconception period it was 1396, significant at the p<0.01 level. A similar effect was detected in cardiologists, who undertook interventional angiographic procedures involving X-ray exposures [76].

Scherb and Voigt studied different groups of inhabitants in a variety of countries after the Chernobyl accident for hereditary effects and found radiation-induced foetal deaths and early mortality, Down’s syndrome and alterations of the birth sex-ratio. They examined nuclear tests above ground which affected US inhabitants, Chernobyl emissions in Europe, and those living near German and Swiss nuclear plants. Results showed significant reduction in the female birth rate in all these [77,78].

The ABCC studies overall involve all the types of research error listed in the introduction, which we believe is the explanation for the failure to see excess heritable damage. The main problem was choice of controls. The sex-ratio studies were abandoned due to seemingly anomalous effects. De Bellefeuille [9] re-examined the issue in 1961 and found that results were biased by employing sex-ratios of children of parents who had both been exposed. Any effects, being in opposite directions, would therefore cancel out; his re-analysis based on children with only one exposed parent showed a clear effect in the expected direction. Padmanabhan [79] recently re-examined the issue using the original controls (abandoned by ABCC). Using the two not in city (NIC) groups Padmanabhan showed significant sex-ratio effects in the expected directions.

Sex-ratio is a very relevant parameter. It shows that genetic alterations are induced in the germ cells of males by very low doses, and it proves to be a sensitive indicator for exposures of the population.

Atmospheric Weapons test Fallout

The most significant global incident in terms of human exposure has been the atmospheric nuclear testing fallout which peaked between 1959 and 1963. It was this testing which worried Muller [1]. The tests increased the rates of neonatal and infant mortality in the US and the UK [80,81]. An interesting insight comes from a Canadian study of CM during the fallout period. le Vann [82] was concerned to examine the link between congenital malformation and the use of the drug thalidomide. He found that in Alberta there was no relation between the use of thalidomide and congenital birth outcomes but noted a strong association with precipitation; areas with high radioactive fallout had high levels of birth defects. Whilst we are not alleging that thalidomide does not have teratogenic effects, since many females in the le Vann study who never took any drugs gave birth to the typical “thalidomide spectrum” babies it seems that exposure to the fallout may have, as Muller [1] feared, have caused an effect. Ignoring this and the infant mortality findings involved a Error Type 3.

Genetic vs. Genomic, Mendelian vs. In Utero

We have not distinguished between Mendelian genetic effects involving the transfer of specific gene mutations to the offspring and effects consequent upon the operation of genomic instability, whereby the offspring inherit a tendency to apparently increase rates of all mutation above the normal rate for that population [83]. For the purposes of the arguments relating to radiation risk of harmful heritable conditions in the first generation such a discussion is unnecessary but needs to be revisited if multi-generational effects are being discussed. The question of germ cell damage in parents vs. in utero damage to development, though important, seems to us to be beside the point. All these CM effects are caused by mutation of DNA whether in the parental germ cells and precursors or from implantation to birth. Our aim is to assess the genetic risk based on observations. However, from the sex-ratio results it would seem that parental exposure is a dominant cause of radiation induced CM.

How Is It That the ICRP Risk Coefficient Is Wrong?

A reviewer asked us to address this question and to provide a brief account of biological mechanism. We begin with mechanism. The ICRP risk model is based on two big ideas: absorbeddose, which is average energy per unit mass of tissue, and the linear no threshold (LNT) response. For internal exposure to substances like Sr-90 and uranium, which both have high affinity for DNA, the concept of dose is meaningless [loc.cit. 6,10]. For CM as an outcome, it is also clear that the LNT model is unsustainable [5], because as the “dose” is increased from zero there are many blocks to the successful journey from germ cell to infant, the CM end point. Biological plausibility would predict an increase in damage and thus CM at very low dose, followed by a drop in CM due to failure to implant, early miscarriage, abortion. This would result in a saturation or “hogs-back” dose response in the lowest dose region. Only the survivors would make it to be registered as CM. The dose response would look like that in Figure 2 where A is the initial outcome and B is where the foetus dies or there is no implantation. The region C would relate to in utero effects later in gestation. There would be a fall in birth rate associated with region B and C; there usually is. You can see this effect most clearly in the EUROCAT studies where relative risk rises and then falls as dose increases [19]. It is perfectly clear in many other studies. It is clear in in analysis of infant leukemia after Chernobyl in 5 countries shown in Figure 3 [84] and the study of cleft palate in Bavaria [38,39] analysed by Korblein [40].

 

eht-31-e2016001f2

Figure 2.

Regions of interest in a theoretically predicted dose response relation (see text and ECRR 2010). Exactly this dose response is seen in infant leukemia rates after Chernobyl in Greece, Germany (three dose regions) Wales, Scotland and Belarus [84]. From

 

3.jpg

Figure 3.

Dose response for infant leukemia in the countries examined in meta-analysis of five reports in Busby 2009 [84] (UK data from Childhood Cancer Research Group Oxford). Effect is fractional excess relative risk, and dose is given by UK National Radiological

 

What Is the Correct Risk Coefficient?

The Chernobyl studies presented in Table 1 may be used to obtain an approximate risk factor for all CM in those exposed to fission spectrum radionuclides as assessed by Cs-137 area contamination. We can employ the data from Wertelecki et al. [30] on internal contamination to assess doses from Cs-137 and Sr- 90. The excess relative risk (ERR) for all CM follows a “hogsback” shaped response and is about 0.5 per mSv at 1 mSv saturating at between 0.1 to 0.2 per mSv at 10 mSv based on cumulative dose as assessed by ICRP models using Cs-137 area contamination as a basis of calculations. This means that the background rate will double or treble up to 10 mSv exposure and thereafter flatten out or fall. But it also results in a 50% excess risk at doses as low as 1 mSv. This ERR and dose response model accommodates all the observational data from Chernobyl and also elsewhere. We must make it clear that this model is for mixed internal and external exposure to fission product contamination doses as employed by UN agencies and may not necessarily apply to pure external exposures (e.g., X-rays, gamma- rays). However, it should be noted that Stewart’s finding of a 40% excess risk of childhood leukemia after a 10 mSv obstetric X-ray dose [71] is comparable with what is found at these higher doses in this review.

Conclusion

Genetically induced malformations, cancers, and numerous other health effects in the children of populations who were exposed to low doses of ionizing radiation have been unequivocally demonstrated in scientific investigations. Using data from Chernobyl effects we find a new ERR for CM of 0.5 per mSv at 1 mSv falling to 0.1 per mSv at 10 mSv exposure and thereafter remaining roughly constant. This is for mixed fission products as defined though external exposure to Cs-137. Results show that current radiation risk models fail to predict or explain the many observations and should be abandoned. Further research and analysis of previous data is suggested, but prior assumptions of linear dose response, assumptions that internal exposures can be modelled using external risk factors, that chronic and acute exposures give comparable risks and finally dependence on interpretations of the high dose ABCC studies are all seen to be unsafe procedures.

Acknowledgments

We are grateful to Marvin Resnikoff and Rick Haaker for running the Microshield program for dose rates over contaminated areas.

Footnotes

The authors have no conflicts of interest associated with material presented in this paper.

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59. Matveenko EG, Borovykova MP, Davydow GA. Physical characteristics and primary morbidity in liquidator´s children. In: Yablokov AV, Busby C, editors. Chernobyl 20 years after. Aberystwyth: Green Audit Books; 2006. pp. 176–179.

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75. Dickinson HO, Parker L, Binks K, Wakeford R, Smith J. The sex ratio of children in relation to paternal preconceptional radiation dose: a study in Cumbria, northern England. J Epidemiol Community Health. 1996;50(6):645–652. [PMC free article] [PubMed]

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77. Scherb H, Voigt K. Trends in the human sex odds at birth in Europe and the Chernobyl Nuclear Power Plant accident. Reprod Toxicol. 2007;23(4):593–599. [PubMed]

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https://www.ncbi.nlm.nih.gov/pubmed/26791091

January 31, 2017 Posted by | radiation | , , | Leave a comment

The Small Plutonium Dust in the Lung

https://blogs.mediapart.fr/ano/blog/221216/la-petite-poussiere-de-plutonium-melox-astrid

Translation from french by Hervé Courtois (Dun Renard)

1, What does a small grain of invisible dust of plutonium arrived in a lung?

2) Why are the lungs of French people at risk?

3) and their wallets?

The small grain of plutonium in a lung

The following text * was written by Maurice Eugène ANDRÉ, commandant, honorary instructor in NBCR, Nuclear, Biological, Chemical and Radiological, of the Royal Air Force of Belgium.

He made a great effort of pedagogy:

“The technical aspect developed below shows that a plutonium dust with a diameter of the order of a micron (millionth of a meter) kills by simply lodging in a lung: this dust in fact delivers more than 100 000 rad [see at the end the notes about units] in one year to a lung area surrounding the dust, a very small area delimited by a sphere with a diameter of the order of one tenth of a millimeter having radioactive dust as the center.

I believe that I must reveal the artifice of calculation used by pronuclear scientists to deceive scientists from other disciplines and the public. Before exposing the calculations themselves, I would give an example of this artifice of calculation by applying it to a domain where the vice of reasoning is more apparent.

Here is the example: one can argue that a rifle bullet is not dangerous. It is sufficient to disregard the point of impact (which, of course, absorbs all the kinetic energy of the projectile) and to assume that all the kinetic energy of the ball will be absorbed by a larger area, as for example the whole surface of the body, in which case it is demonstrable that no point of rupture of the flesh will be found. In this example, you will immediately understand the flaw of reasoning which is to disregard the actual fact that the bullet attacks a specific location and not the whole body or a whole organ. It forces rupture at a point because it concentrates all its energy on a small surface or area, and, with equal energy, the smaller this zone, the more certain is the rupture.

Thus, in the case studied for plutonium dust, they seriously deceive the public if they suppose, in the calculations, that the energy released in a determined time by the radioactive dust is diffused throughout the lung, when in reality, it attacks with great precision a well-defined zone of the lung and is therefore very dangerous because it can cause death.

Lus add for non-scientists that, in the case of Pu 239 dust with a diameter of the order of one micron, lodged in a lung, the area to be considered (the small sphere of flesh surrounding the dust) is injured at the rate of one particle shot (ejection of a nucleus of helium projected into the flesh at about 20,000 km per second) every minute (more exactly 1414 shots per one thousand minutes).

Under these repeated conditions of aggression, the body is unable to restore the area, however small it may be, constantly destroyed. Everything happens, in fact, as if they were asking masons to build a house around a submachine gun that would shoot in any direction, and without warning, about a shot every minute.

In this example, it will be understood that the “masons” are the biological materials drained by the body towards the destroyed zone in order to carry out repairs, while the “house to build” is the area of the lung to be restored. Finally, it will be understood that the role of the “submachine gun” is brilliantly held by the radioactive dust of plutonium which can shoot, without interruption, at the same rate, many years (a plutonium dust only decreases its rate of fire very slowly reaching half that rate only after the enormous period of twenty-four thousand years, a very long period in relation to the duration of a man’s life). […] The phenomenon of the considered intensive and uninterrupted shooting is played on a very small scale, but this does not change the reality, which leads, no more and no less, to the onset of lung cancer.

It is the finding that a local and repeated irradiation is harmful and presents necrosing effects: The cancer will proliferate throughout the body from the area, however small it may be, subjected to intense ionization for a sufficient time. In fact, it is a question, on the part of the body, of a reaction to the exhaustion of the faculty of reparation in a very precise place which has been destroyed a very large number of times. “

* It was published in “Studies and expansion”, Quarterly, No. 276, May-June 1978, and reproduced in the book of Wladimir Tchertkoff, “The Crime of Chernobyl-The Nuclear Gulag”, Actes Sud, 2006, p. 83-5.

Illustration

An autoradiographic study (auto because it is the sample that produces the radiation itself) was done on alveolar macrophages extracted by pulmonary lavage of rats exposed to MOX Massiot et al., 1997, “Physico-chemical characterization of inhalable powders of mixed oxides U, Pu)O2 from the COCA and MIMAS processes “ , Radiation protection vol. 32, No. 5: 617-24; https://www.cambridge.org/core/journals/radioprotection/article/div-classtitlecaracterisation-physico-chimiques-des-poudres-inhalables-dandaposoxydes-mixtes-u-puospan-classsub2span-issues-des-procedes-coca-et-mimasdiv/8FFB37C9DCB12F360802D9099C0E3761). To ± save La Hague and Areva, this powder consisting of 3 to 12% plutonium is used in the atomic reactors ~ 900 Megawatt of EDF.

It was found that “a great heterogeneity of the dose distribution within the pulmonary tissues after inhalation” (Figure 1)

pu-mox-poumon.jpg

Stars Traces alpha Pu emissions, lung cells © Massiot et al 1997, ffig. 3

 Fig. 1. Autoradiography of rat alveolar macrophages extracted by pulmonary lavage after MOX powder inhalation; exposure time 24h; (Massiot et al 1997, figure 3).The small lines starting from the particles are the traces of alpha disintegrations which destroy the biological tissue on their route.

The authors write: “Autoradiographic analysis confirms the presence of hot spots (Figure 3) whose activity is compatible with the presence of pure PuO2 particles and shows the presence of numerous particles with Low specific activity (1 to 2 traces per day). ” (…) Thus, in terms of radiotoxicology, the problem posed is not limited to the presence of hot spots, but to their association with a much more homogeneous irradiation due to particles of low specific activity. It should be emphasized here that no experimental data are currently available to assess the risks associated with such exposure.” (Massiot et al., 1997, pp. 622-23). This remark was made two years after the opening of MELOX. The future may leave us some funny surprises …

Melox, tons of fine plutonium powder

MELOX, a project carried out since 1986 by the powerful member of the “corps des mines” Jean Syrota, started in 1994-95 and has the right to produce 115 tons of MOX oxide per year (about 100 tons of heavy metal) for France, for Germany (1/3 of the production of MELOX in 2001), Switzerland and before Fukushima for Japan … which also store plutonium at La Hague.
Indeed, plutonium, which is produced in all reactors, can only come from a chemical reprocessing plant of the La Hague type. It must be extracted: fuming nitric acid, massive discharges of krypton-85 etc. MELOX is in some ways the obligatory after-sales service of such a factory. It takes the two or nothing.

melox-billet.jpg

MELOX chimney© Areva

Fig. 2. One of the two chimneys of MELOX in Marcoule. The air extracted from the depressurized workshops handling the ultra-fine Uranium and the plutonium powder, is expelled through cascade filters by these chimneys

The plutonium powder (80 μm, mass area 3.5-5 m2 / g) comes from La Hague and the uranium powder from Pierrelatte. There are on-site buffer storages. A primary mixture of 30% PuO2 is put into ball mills for 90 minutes and go thru a 15 μm granolumetry. Posterior fit with uranium powder. The powder is therefore very thin and fluid to be able to be poured like a liquid in tiny dices of one centimeter. It is eminently dispersible by any breath. There were echoes during the dismantling of the Marcoule AT-Pu which preceded MELOX: “The entire internal surface of the machine is covered with a thin black film,uranium and plutonium powder. with grains of a few microns, the highly volatile plutonium and uranium powder was deposited everywhere. On the surfaces of the boxes, on, under and inside the equipments, in all interstices. “ (Libération 28/10/09, S. Huet). In October 2009, after hiding it for several months,The CEA announced that the plutonium fuel dust that had slipped through the interstices over the years was not about 8 kg As they had “estimated” but “about” 39 kg.There was a theoretical risk, that the CEA was unaware, of a criticity accident (the “critical mass” announced being about 16 kg) for its staff.

Such plants must be completely sealed and it is imperative that the expelled air (air drawn from the workshops to be depressurized) to be filtered with great finesse. The cascading filters presented in the flyers like the top of the top, are an absolute, the least, of necessity. That said if (or when) it flees nobody knows it if the operator does not say it. It is completely impossible for an individual, and even many laboratories, to identify plutonium.

MELOX uses about 7 tons of plutonium per year that passes in powder form and therefore any situation of non-containment represents an enormous risk on the Cotes du Rhône and the Valley (Aircraft, explosion, earthquakes with very probable liquefaction on such a site with sandbanks, breaking the waterproofing, etc.). This would require the evacuation of very large areas (Wise-Paris : http://www.wise-paris.org/francais/rapports/030305MeloxEP-Resume-fin.pdf p.6)..

The CEA-Astrid project, three handfuls of billions

While Phenix in Marcoule still has a part of its irradiated fuel in the belly under its storage shed, its sodium heated by electrical resistances (until 2030), The CEA wants to build another Superphenix (with the same metallic sodium), project which it renamed Astrid.

This one, they want it with a fuel more and more “hot”: 25% of plutonium.

Unfortunately Areva-MELOX being very automated can not do that … So they need another MELOX. The National Commission of Evaluation, CNE, set up by the Bataille-Revol-Birraux laws of 1991 and 2006 was tasked to help with the task. In its 2010 report (Appendix p.28) the CNE wrote: “The construction of the Astrid reactor must be accompanied by the commissioning of a Mox fuel fabrication plant (AFC) in La Hague …” And the first page of the summary of its 2013 report for decision-makers: “In a tense economic context, the Commission considers a top priority … Astrid as well as the fabrication plant for the manufacture of its fuel”.

Then after that ? What should be done with this very “very hot” irradiated fuel from an Astrid? Areva-La Hague, UP2-800 and UP3 can not handle it.

The 2011 CNE Report (p.14): “… Astrid reactor and a reprocessing pilot that allow to test the different operations related to the recycling of plutonium and americium … Demonstrate that the dissolution of irradiated fuel … with much higher levels of actinides than in PWR fuel is controlled “And in its 2012 report, chapter on Astrid p.13: “Passage to the realization of the project … it is essential to conduct the following actions: – Construction of a reprocessing pilot … “; And CNE 1st page of last report (Nov 2013): “In a tense economic context … In a second stage a reprocessing plant for the fuel Mox irradiated in Astrid”. Yes, what could not go wrong…

In fact the “Astrid project of the CEA” is simply that it wants to reconstructs its entire cycle in brand new.

It would not in any way of any use for the wastes that the nuclear industry of the moment manufactures which are glasses, bitumens and concretes. For proof, for those the government sends to Bure the mobile gendarmes. The CEA needs for its triple project, three handfuls of billions of euros: one for the Melox-Astrid, one for the Astrid reactor and one for the reprocessing-Astrid. The CEA eagerly seeks, and thanks to one of their own, they may have already found a part of it via the “CO2 tax of the IPCC” on the households (Astrid would be “non-carbon”, so “clean”, he-he …https://blogs.mediapart.fr/ano/blog/151116/jean-jouzel-iii-le-collecteur-de-fonds-le-fioul-lourd-et-les-employe-e-s-jetables) But a bundle of billions is needed, And they are also looking for the japanese taxpayers of Fukushima (France wants Japan to share 570 billion yen ASTRID reactor development cost http://mainichi.jp/english/articles/20161022/p2a/00m/0na/005000c).
Reminders :

1, A plutonium 239 dust with a diameter of 1 μm weighs 0.000 000 000 015 gram or 15 picograms. Invisible but quite destructive …

2, Units: Gray (rad) Sievert

The rad (which is mentioned once in the small text of Maurice Eugene ANDRÉ at the head of this post) is an energy unit that has been replaced by a larger unit, the gray, Gy (100 rad = 1 Gy).

Often one speaks in Sievert, Sv, or in milliSievert (mSv, thousandths of Sv). The Sievert is a measure of “damage” (gross translation of the gray on the living). We pass from one to the other by a factor Wr:

Dose in Gy × Wr = dose in Sv

The factor Wr is 1 for the X and gamma radiations. For the alpha radiation (Pu, U, Am …) it was 10, I think it became 20 at least for some. It is also increasing for beta (was 1, an English institute switches to 2 for tritium for example). This means that their deleterious effects were underestimated.

3, Another reminder: For the public the current standard, it is by its definition of a limit between the admissible and the inadmissible, of an added artificial dose (total of all the anthropic exposures, except medical) of 1 mSv / year. It is an arbitrary choice based on the principle that all human activity has consequences.

This value indicates from the official factors that this dose received by 1 million people must produce 50 fatal cancers, 13 serious genetic abnormalities and 10 curable cancers. It is not as one sometimes reads a dose of safety.

 

January 10, 2017 Posted by | radiation | | Leave a comment

World Health Organisation confirmed that low dose radiation increases cancer risk

 http://fukushimawatch.com/2015-11-05-multiple-studies-confirm-exposure-to-low-levels-of-radiation-can-cause-cancer.html The World Health Organization (WHO) has confirmed what Fukushima Watch has been reporting for quite some time now — namely, that exposure to low doses of radiation overtime increases the risk of cancer.

The results of the study, published in the prestigious British Medical Journal (BMI), provide “direct evidence about cancer risks after protracted exposures to low-dose ionizing radiation,” said the International Agency for Research on Cancer (IARC), the cancer agency of the World Health Organization.

The findings demonstrate “a significant association between increasing radiation dose and risk of all solid cancers,” the study’s co-author, Dr. Ausrele Kesminiene, told sources.

“No matter whether people are exposed to protracted low doses or to high and acute doses, the observed association between dose and solid cancer risk is similar per unit of radiation dose,” he added.

radiation-causing-cancer

Nuclear workers around globe at heightened cancer risk Continue reading

January 2, 2017 Posted by | 2 WORLD, radiation, Reference | Leave a comment

Ionizing radiation from Chernobyl affects development of wild carrot plants. Abstract

Latest Chernobyl paper shows radiation effects of wild carrots!

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Abstract
“Radioactivity released from disasters like Chernobyl and Fukushima is a global hazard and a threat to exposed biota. To minimize the deleterious effects of stressors organisms adopt various strategies. Plants, for example, may delay germination or stay dormant during stressful periods. However, an intense stress may halt germination or heavily affect various developmental stages and select for life history changes. Here, we test for the consequence of exposure to ionizing radiation on plant development. We conducted a common garden experiment in an uncontaminated greenhouse using 660 seeds originating from 33 wild carrots (Daucus carota) collected near the Chernobyl nuclear power plant. These maternal plants had been exposed to radiation levels that varied by three orders of magnitude. We found strong negative effects of elevated radiation on the timing and rates of seed germination. In addition, later stages of development and the timing of emergence of consecutive leaves were delayed by exposure to radiation. We hypothesize that low quality of resources stored in seeds, damaged DNA, or both, delayed development and halted germination of seeds from plants exposed to elevated levels of ionizing radiation. We propose that high levels of spatial heterogeneity in background radiation may hamper adaptive life history responses.”

Zbyszek Boratyński, Javi Miranda Arias, Cristina Garcia, Tapio Mappes, Timothy A. Mousseau, Anders P. Møller, Antonio Jesús Muñoz Pajares, Marcin Piwczyński & Eugene Tukalenko

http://www.nature.com/articles/srep39282

December 19, 2016 Posted by | radiation | , , | Leave a comment

Ionizing Radiation from Chernobyl and the Fraction of Viable Pollen

Tim Mousseau – latest Chernobyl paper in International Journal of Plant Sciences:

Oct 05, 2016

Pollen viability is an important component of reproductive success, with inviable pollen causing failure of reproduction. Pollen grains have evolved mechanisms to avoid negative impacts of adverse environmental conditions on viability, including the ability to sustain ionizing radiation and repair DNA. We assessed the viability of 109,000 pollen grains representing 675 pollen samples from 111 species of plants in Chernobyl across radiation gradients that spanned three orders of magnitude. We found a statistically significant but small and negative main effect of radiation on pollen viability rates across species (Pearson’s r = 0.20). Ploidy level and the number of nucleate cells (two vs. three) were the only variables that influenced the strength of the effect of radiation on pollen viability, as reflected by significant interactions between these two variables and background radiation, while there were no significant effects of genome size, pollen aperture type, life cycle duration, or pollination agent on the strength of the effect of radiation on pollen viability.

Introduction

Most organisms are susceptible to environmental perturbations—such as climate change, extreme weather events, pollution, changes in nutrient availability, and changes in ionizing radiation levels—but the effects of such perturbations on individuals, populations, and ecosystems are variable (Candolin and Wong 2012; IPCC 2013; Møller and Mousseau 2013). In order to better understand these effects and to predict how a given species would respond to environmental disturbances, a study of the specific effects at different stages of organisms’ life cycles is required. Since reproduction is a key phase in the life cycle of any organism, reproductive effects are of particular interest. In the case of the effects of ionizing radiation, the negative consequences for reproduction in response to acute irradiation have been studied for decades and are well established (review in Møller and Mousseau 2013). However, the effects of long-term chronic exposure to low dose radiation are poorly understood.

Pollen grains are susceptible to the effects of environmental perturbations, which can have significant negative consequences for plant reproduction through pollen limitation (Delph et al. 1997; Ashman et al. 2004). Potential negative environmental effects include those resulting from elevated levels of ionizing radiation (Koller 1943). Therefore, plants have mechanisms to protect themselves from such effects, such as DNA repair, bi- or trinucleate cells, or redundancies in the genome resulting from duplications.

The area around Chernobyl in Ukraine has proven particularly useful for studying the effects of radioactive contamination on ecological and evolutionary processes at a large spatial scale. The Chernobyl nuclear accident in April 1986 led to the release of between 9.35 × 103 and 1.25 × 104 petabecquerel of radionuclides into the atmosphere (Møller and Mousseau 2006; Yablokov et al. 2009; Evangeliou et al. 2015). These radioactive contaminants were subsequently deposited in the surrounding areas of Belarus, Russia, and Ukraine but also elsewhere across Europe and even in Asia and North America. The pattern of contamination is highly heterogeneous, with some regions having received much higher levels of radionuclides than others, owing to atmospheric conditions at the time of the accident (fig. 1). To this day, the Chernobyl area provides a patchwork of sites that can differ in radioactive contamination level by up to five orders of magnitude across a comparatively small area. Even decades after the accident, the amount of radioactive material remaining around Chernobyl is enormous (Møller and Mousseau 2006; Yablokov et al. 2009).

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Fig. 1. Map of the distribution of radioactive contamination in the Chernobyl region, with pollen sampling locations marked. Adapted from DeCort et al. (1998).

Because of the unprecedented scale and global impact of the Chernobyl event, it is not surprising that it generated significant interest in both the scientific community and the general public. As a result, studies have been conducted to assess the consequences of Chernobyl for human health and agriculture as well as its biological effects, ranging from the level of DNA to entire ecosystems. Since ionizing radiation has long been well established as a mutagen (Nadson and Philippov 1925; Muller 1950), a large proportion of the research effort has focused on examining changes in mutation rates in areas that have been radioactively contaminated to different degrees as a result of the accident. Although there is considerable heterogeneity in the results of these studies, most have detected significant increases in mutation rates or genetic damage following the Chernobyl disaster, with the rates remaining elevated over the following 2 decades (reviewed in Møller and Mousseau 2006). For example, the mean frequency of mutations in Scots pine (Pinus sylvestris) is positively correlated with the level of background radiation, and it is 10 times higher in contaminated areas compared with control sites (Shevchenko et al. 1996). A study of Scots pine seeds detected elevated mutation rates within the exclusion zone over a period of 8 yr following the accident (Kal’chenko et al. 1995). In wheat (Triticum aestivum), the mutation rate was six times higher in radioactively contaminated areas compared with controls (Kovalchuk et al. 2000). Likewise, the frequency of chromosomal aberrations in two varieties of wheat grown within the Chernobyl exclusion zone 13 yr after the disaster was elevated compared with the spontaneous frequency of chromosomal aberrations in these cultivars (Yakimchuk et al. 2001). The levels of chromosome aberrations in onions (Allium cepa) were also positively correlated with the intensity of radioactive contamination in plants grown 20 yr after the accident (Grodzinsky 2006). Therefore, there is considerable evidence showing increased mutation rates in plants in the most contaminated sites (Møller and Mousseau 2015).

On the basis of the results of these studies, one might expect that a similar relationship between radiation level and the frequency of abnormalities would be seen in pollen. Indeed, Kordium and Sidorenko (1997) reported that the frequency of meiotic anomalies in microspore formation and the frequency of pollen grain viability was reduced in 8%–10% of the 94 plant species studied as a function of the intensity of gamma radiation 6–8 yr after the accident. In violets (Viola matutina), the proportion of viable pollen was negatively correlated with background radioactive contamination (Popova et al. 1991). While it is evident that plants differ in their susceptibility to ionizing radiation, the reasons for this variation are not entirely clear. It is likely that some species develop tolerance and/or resistance to mutagenic effects of radiation to a greater extent than others (Baer et al. 2007). For example, pollen of silver birch (Betula verrucosa), which grows in areas contaminated by the Chernobyl accident, showed elevated DNA repair ability compared with pollen from control areas, consistent with adaptation or epigenetic responses to increased radiation (Boubriak et al. 2008). There are also indications that genome size might affect the response of different species to radiation. Among the plants studied by Kordium and Sidorenko (1997), the rate of pollen viability decreased with increasing radiation to a higher degree in plants with smaller genomes (Barnier 2005), although the actual mechanism remains unknown. One potential explanation is that a larger genome might contain multiple copies of some genes as a result of duplication, rendering mutations in one of these copies less deleterious than if there were only a single copy present, although this explanation may not universally apply (Otto 2003).

In order to assess the effects of radioactive contamination on plant reproduction and to further assess species-specific differences in the effects of ionizing radiation on pollen viability, we analyzed pollen samples from plants growing in the Chernobyl region. We expected that the effects of radiation would differ among species, with some plants showing higher pollen inviability rates than others as a result of elevated radiation levels. A second objective was to test whether observed differences in pollen viability rates could be attributed to differences in phenotype among species, with possible explanatory factors including pollen size, the number of pollen apertures, ploidy, genome size, bi- or trinucleate cells, life span (annual vs. perennial), and pollination agent. We hypothesized that each of these factors could be related to the plants’ ability to resist or to tolerate radiation-induced mutations. Pollen size, genome size, and ploidy are all related to the amount of DNA and the number of copies of genes contained in the pollen grain. Because the pollen aperture—as the site of pollen germination—could be particularly susceptible to radiation-induced damage, we included the number of apertures as a potential explanatory variable. Furthermore, whether a plant is annual or perennial is related to individual longevity and, consequently, to the number of mutations that can accumulate over its lifetime as well as to the number of generations from the time of the Chernobyl accident until the time of sample collection. This may be particularly relevant for plants, given that germ tissue is derived from somatic tissues during each reproductive event as opposed to most animals, in which germ cells terminally differentiate very early during embryonic development (Buss 2006). Pollen viability depends on the ability of pollen to assess the integrity of its DNA and to repair the DNA of the generative nuclei before division (Jackson and Linskens 1980). This process is particularly important for binucleate pollen cells in which this happens during pollen germination, which is in contrast to trinucleate pollen cells, in which the need for DNA repair during pollen germination is less evident. DNA repair efficiency and adaptation of plants to chronic irradiation may also depend on the composition of radiation at the contaminated sites (Boubriak et al. 1992, 2008).

Across all plant species, we found a statistically significant relationship between radiation and the frequency of viable pollen of an intermediate magnitude (Cohen 1988). We also documented significant interactions between species and radiation, radiation and cell number, and radiation and ploidy. However, the significant effect of ploidy disappeared when both ploidy and whether cells were bi- or trinucleate were entered simultaneously in a single model. Most effects were small to intermediate in magnitude, as is commonly the case in studies of living organisms (Møller and Jennions 2002). We emphasize that our study included by far the largest sample size so far reported to detect effects of chronic radiation on pollen viability. However, we also emphasize the limits of our study. Many plant species could not be included simply because we could not locate multiple flowering specimens during our fieldwork. These and other sampling limitations reduced the number of pollen grains and the number of species that could be included.

Species differ in their susceptibility to radiation, as demonstrated for birds at both Chernobyl and Fukushima (Møller and Mousseau 2007; Møller et al. 2013; Galván et al. 2014), and in terms of adaptation to radiation (Galván et al. 2014; Møller and Mousseau 2016; Ruiz-González et al. 2016). The observed interspecific differences in radiation effects reported here for the proportion of viable pollen could be due to adaptation to radiation through tolerance of radiation-induced mutations or through induction of increased DNA repair in organisms living in contaminated areas. Another possibility is that some species are more resistant to radiation because of historical exposure in radiation hotspot areas with high natural levels of radiation (Møller and Mousseau 2013).

We observed a significant relationship between the proportion of viable pollen and the interaction between ploidy and radiation. Such a finding might suggest that resistance to deleterious effects of radiation is based on redundancy in the genome, where species with higher ploidy levels have an advantage if they have multiple copies of a given gene. We failed to detect an effect of selected physical attributes of pollen grains—such as genome size, pollen size, and aperture type—on the susceptibility of pollen to radiation. Furthermore, whether a plant was annual or perennial or whether it was insect or wind pollinated did not affect the proportion of viable pollen. Finally, whether plants produced bi- or trinucleate pollen had a significant effect on pollen viability, and the interaction between radiation and cell number was also significant.

While we confirmed the general finding of Kordium and Sidorenko (1997) that in approximately 10% of species the proportion of viable pollen is negatively correlated with radiation level, we were unable to reproduce their findings with respect to the overall magnitude of this effect. Our observed effect size was much smaller, and the slopes for individual species differed significantly from those reported by Kordium and Sidorenko (1997). Because more than 10 yr have passed between the two studies, we suggest that a change in radiation effects has taken place over time, for example, as a result of adaptation or accumulation of mutations. Another possible explanation for the discrepancy has to do with sample size, since our study included a much larger number of pollen samples and sampling locations than the study by Kordium and Sidorenko (1997). These explanations are not necessarily mutually exclusive.

Whereas other studies have demonstrated significant negative effects of radioactive contamination around Chernobyl on mutation rates and fitness in general, our study of pollen viability shows a very small effect, and some species even show positive relationships between pollen viability and radiation that is suggestive of adaptation to increased levels of radiation. However, on the basis of the current study, it is not possible to determine whether the observed heterogeneity reflects evolved adaptive responses or is the consequence of unmeasured selective effects on characters correlated with pollen viability, which could in part explain an overall positive effect of radiation (for a discussion of evolutionary responses in Chernobyl, see Møller and Mousseau 2016). Experimental approaches would be needed to decipher the mechanisms underlying the heterogeneity in plant responses observed here (Mousseau 2000).

The observed variability in susceptibility to radiation is a common finding in studies of the effects of radiation from Chernobyl (Møller and Mousseau 2007; Galván et al. 2011, 2014; Møller et al. 2013). While our results are consistent with earlier findings that DNA repair mechanisms may play an important role in adaptation to life in radioactively contaminated environments—especially for plants, which are sessile and hence cannot move to less contaminated areas—further research is required to test this explicitly. Finally, because of the observed differences in resistance to radiation among species, it is likely that even small overall effects of radiation—such as the one on the proportion of viable pollen described here—can have significant consequences for species composition and abundance at a given location and, therefore, for ecosystem characteristics and functioning.

In conclusion, we have found a statistically significant overall negative relationship between radiation intensity and the frequency of viable pollen in plants growing in contaminated areas around Chernobyl. The magnitude of this effect across species included in our study was intermediate. We only found a significant relationship between the proportion of viable pollen and ploidy × radiation interaction, bi- or trinucleate cells, and bi- or trinucleate cells × radiation interaction. This suggests that DNA repair mechanisms could play an important role for the ability of plants to resist increased radiation, at least when it comes to pollen formation.

Acknowledgments

We thank Puri López-García for use of a microscope for pollen counts. This work has benefited from the facilities and expertise of the cytometry platform of Imagif (Centre de Recherche de Gif; http://www.imagif.cnrs.fr). We thank Spencer Brown and Mickaël Bourge for their help with the flow cytometry measurements and Srdan Randić for help with pollen counts. Field collections for this study were supported in part by the Centre National de la Recherche Scientifique (France), the North Atlantic Treaty Organization Collaborative Linkage Grant program, the Fulbright program, the University of South Carolina College of Arts and Sciences, and the Samuel Freeman Charitable Trust. Two reviewers provided constructive criticism.

Read full paper at:

http://www.journals.uchicago.edu/doi/full/10.1086/688873

 

 

 

December 9, 2016 Posted by | radiation | , , , | Leave a comment

No need for a nuclear reactor to produce medical isotopes: Canada shows the way.

14 September 2016. A consortium of institutions led by TRIUMF, Canada’s national laboratory for particle and nuclear physics and accelerator-based science, is granting sole rights for its proprietary technetium-99m (Tc-99m) production technology to ARTMS™ Products, Inc (ARTMS). Technetium-99m is used in over 80% of all nuclear medicine imaging procedures and is vital to patient care in areas such as cardiology, oncology, and neurology. …

text Medical isotope production

Typically sourced from an ageing global reactor fleet, Tc-99m has been subject to significant supply disruptions in recent years. ARTMS’ production technology promises to provide a reliable, cost effective, and safe supply of this critical medical isotope. The license includes all the required products and procedures for the production of Tc-99m using common hospital-based and commercial cyclotrons, through the bombardment of a high-energy proton beam against specific chemical ‘targets’. ….

“The ARTMS production technology offers many advantages, and that is why we believe our technology is truly disruptive and that it will gain widespread adoption,” Dr. Schaffer added. “Not only does the ARTMS production technology provide regional supply security of Tc-99m, it also offers favourable economics, and aids to eliminate the need for highly-enriched uranium, which is currently used by nuclear reactors to produce this isotope.”

“This agreement represents the culmination of six years of hard work by a dedicated team from across Canada, including TRIUMF, the BC Cancer Agency, Lawson Health Research Institute, and the Centre for Probe Development and Commercialization,” said Dr. Jonathan Bagger, Director of TRIUMF. “Today marks the completion of a major milestone as we move to commercialize a decentralized, green, and Canadian-made, technology that can produce Tc-99m daily at hundreds of hospital-based cyclotrons around the world. This licensing agreement marks the beginning of a new era in Tc-99m production and supply security.”

More information on the recent global isotope shortages, Tc-99m, and the story of ARTMS can be found in this media backgrounder and more information on medical isotopes and cyclotrons can be found in this FAQ.    http://www.triumf.ca/current-events/artms%E2%84%A2-products-inc-licenses-canadian-technology-address-global-medical-isotope

December 2, 2016 Posted by | Canada, health, radiation, Reference | Leave a comment

Radiation Protection With Apple-Pectin

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Apple pectin has the ability to sweep out radioactive dust particles from the intestinal tract, and it was used extensively after the Chernobyl nuclear plant meltdown.

Apple pectin, for example, along with other fruits that contain this soluble fiber and polysaccharride carbohydrates are great radioprotective agents.

A study showed that apple pectin can absorb and chelate cesium out of the body. Since the focus was only on cesium, it is unknown if it also carried out any other heavy metals.

How Apple Pectin Works

Apple pectin is a soluble dietary fiber source. The fibers in apple pectin help to balance the colon. In the digestive tract, apple pectin swells, forming a gel which acts like a broom to sweep the entire intestinal tract of waste material and body fat. In the large intestines, apple pectin breaks down into short chain fatty acids, which have positive pre-biotic benefits. Apple pectin is considered safe by the FAO/WHO Joint Expert Committee on Food Additives.

Apple Pectin and Radioactive Protection After Chernobyl

Both master herbalist Dr. Richard Schulze and nutriceutical researcher Jon Barron have recently mentioned that apple pectin was used after the Chernobyl nuclear reactor disaster in 1986. Jon Barron states that “apple pectin was used in the aftermath of Chernobyl to reduce the load of radioactive cesium in children.” Dr. Schulze says that apple pectin was used “extensively” after the Chernobyl disaster. He mentions that apple pectin has been proven to remove heavy metals, and even radioactive Strontium 90. Dr. Schulze says that taking apple pectin proved to significantly prevent damage from radiation exposure.

Apple Pectin Reduces the 137Cs Radioactive Cesium Load in Chernobyl Children

The Swiss Medical Weekly published a report in 2004 confirming that apple pectin was seen to reduce the 137Cs cesium uptake in Ukrainian children after the Chernobyl nuclear reactor disaster. A study led by V.B. Nesterenko at the Belrad Institute of Radiation Safety was performed to see if orally administered apple pectin was effective in binding 137Cs in the gut for food contaminated by radiation, or if eating “clean,” non-contaminated food was enough. The study was a randomized, double-blind, placebo-controlled trial involving children from contaminated villages near the disaster area.

Radiation levels were measured at the beginning of the study and one month later. At the end of the trial, 137Cs cesium levels in children who were given apple pectin were reduced by 62%. Children who had received “clean” food and a placebo had reduced radiation levels by only 13.9%. The results were determined to be statistically significant.

Other fruits besides organic apples that are high in pectin include grapefruit, oranges, and lemons. But in citrus, as in apples, most of the pectin is in the peel. You can also utilize many berries for their pectin, too, including raspberries, strawberries, and blueberries, to name a few.

Sure, you could eat an apple, but you could also take a fruit pectin supplement to reap the benefits.

https://organicslant.com/radiation-protection-with-apple-pectin/

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November 13, 2016 Posted by | radiation | , | Leave a comment

Study pinpoints protein that detects damage from radiation

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Small intestine tissue from mouse after high-dose X-ray radiation. Green fluorescence shows dying epithelial cells.

High doses of radiation from cancer treatment can cause severe damage to cells and tissues, resulting in injury to bone marrow and the gastrointestinal tract. The consequences can be fatal. Yet researchers do not fully understand how exposure to radiation triggers this damage at the molecular level.

Led by Yale professor of immunobiology Richard Flavell, an international team of researchers studied the radiation response using animal models. They identified a novel mechanism of radiation-induced tissue injury involving a protein called AIM2, which can sense double-strand DNA damage and mediate a special form of cell death known as pyroptosis.

They observed that in animals lacking AIM2, both the gastrointestinal tract and bone marrow were protected from radiation. While the role of AIM2 as a sensor that detects infectious threats to the body was known, this study is the first to describe the protein’s function in the detection of radiation damage to the chromosomes in the nucleus, said the researchers.

When a cell receives a high dose of radiation, the DNA is broken into pieces, which can be joined together again. However this aberrant rejoining of chromosomal fragments can lead to chromosomal abnormalities and cancer. Flavell and his team believe that when this chromosomal damage is inflicted, the AIM2 pathway is activated in order to kill the cell to avoid the deleterious consequences of these chromosomal translocations, such as those commonly seen in cancer cells.

For this reason, the cells that accumulate this chromosomal damage are dangerous to the person or animal and are therefore killed by this AIM2 pathway. This pathway is beneficial to the person or animal under normal circumstances because it eliminates dangerous cells, but when a high dose of radiation is given the pathway is detrimental because it leads to bone marrow and digestive tract injury.

These findings suggest that a drug that blocks or inhibits the AIM2 pathway could potentially limit the deleterious side effect of chemotherapy or radiotherapy on cancer patients, said the researchers.

Read the full paper in Science.

http://news.yale.edu/2016/11/10/study-pinpoints-protein-detects-damage-radiation

November 11, 2016 Posted by | radiation | , | Leave a comment

Russia, Japan Team Up to Study How Radiation Affects the Next Generation’s DNA

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Russia and Japan are set to team up to become leaders in transgenerational healthcare research, to help prevent the effects of nuclear catastrophes being passed genetically from one generation to the next indefinitely.

Both Russia and Japan have a stake in this research, given that both countries are still dealing with radiation exposure via the events in Nagasaki, Hiroshima, Fukushima and Chernobyl. “This research is extremely important in relation to future generations we are responsible for,” said Nomura Taisei, Radiation Biology and Medical Genetics Department Head at National Institute for Biomedical Research at Osaka University.

The professor was at the 15th Congress on Innovation Technologies in Pediatrics and Pediatric Surgery which was held in Moscow from October 25-27, making a report on trasngenerational healthcare. His report shines a light on how exposure to radiation is passed down through generations via DNA mutation.

When DNA is damaged, the consequences for future generations are serious.Birth abnormalities, developmental disorders, a weakened immune system, higher cancer risks, and numerous physical and mental disorders are all the result of these gene mutations passed down to future generations. While the effects of radiation exposure passing between generations has so far not been widely studied in humans, the effects on experimental animal subjects is more widely understood.

Professor Nomura’s experiments on mice proved that genetic effects of radiation exposure can cause genetic defects into the 58th generation. The problem is that Japan has very little data on radiation exposure on humans.

This is where Russia can help, through opening up their database on three tree generations of people: those who were exposed after the Chernobyl disaster, those who were exposed prenatally, and those whose parents were exposed before impregnation. Thus Russia and Japan can now conduct joint comparative research of the effects of radiation on animals and on humans applying the latest technologies.

The Head of Children’s Scientific and Practical Center of Radiation Protection, Larisa Naleva told Sputnik Japan about the importance of this Russian-Japanese research project.

“We assume that the phenomenon of radiation-induced genetic instability has significant effects not only on the health of exposed people but also on the health of their children, first of all, resulting in an increased cancer risk. We have already detected an increase of morbidity in the second generation of exposed people’s descendants and now we are studying the third generation. Today in Russia there are about 135 thousand children who have been exposed or are exposed to radiation to some extent,” said Naleva. By using Japan’s expertise, Naleva hopes that the health risk for subsequent generations of those who were exposed to radiation can be reduced. “And that is the goal of our collaboration with our Japanese colleagues,” she said.
https://sputniknews.com/society/201611021046998030-russia-japan-radiation-dna/

November 4, 2016 Posted by | radiation | , , , , , | 1 Comment

Mother’s Radiation Lab and Clinic 

No High Level International Nuclear Waste Dump in South Australia, Paul Richards, 2 Nov 16  Exactly what the radiation fuel cycle means to all mothers in the Fukushima region by looking at the outcome of the nuclear disaster, more on a day to day basis

The relatively short video shows a female perspective of how women are dealing with the risk despite the Japanese governments, lack of radiation testing, children’s health checks, financial and social support – the social responsibility to their community

Women suffer the most from this stoic denial that radiation effects the community, causing unnecessary stress from risk of radionuclide ingestion on a child’s growing body, well established to be many times more sensitive to radiation due to rapidly dividing cells programmed by DNA at risk during early development

It is sad a mother’s worldview has been largely left out of the South Australian debate around the whole nuclear cycle dominated by senior male nuclear sales executives and academics

However, that isn’t any surprise, as that is how the world embraced the whole nuclear industry in the first place, that is from a purely patriarchal worldview and that is a matter of our species shameful human history  https://www.facebook.com/groups/1314655315214929/

November 4, 2016 Posted by | Japan, radiation | Leave a comment

Ionizing radiation May Contribute to Development of Alzheimer’s

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University of Southern Denmark

More humans than ever are exposed to higher levels of ionizing radiation from medical equipment, airplanes, etc. A new study suggests that this kind of radiation may be a confounding factor in the neurodegenerative disease Alzheimer´s.

Alzheimer’s disease is the leading cause for dementia in the elderly, and its global prevalence is supposed to increase dramatically in the following decade – up to 80 million patients by 2040.

– It is crucial that we investigate the potential factors behind this disease, says postdoc Stefan J. Kempf, University of Southern Denmark. His research focuses on possible connections between radiation and cognitive impairments.

In a new study, he and an international consortia involving colleagues from Italy, Japan, Germany and Denmark show that low doses of ionising radiation induce molecular changes in the brain that resemble the pathologies of Alzheimer’s.

The study has been published in Oncotarget. Co-authors are from Institute of Radiation Biology/Institute of Pathology, Helmholtz Zentrum München, German Research Center for Environmental Health and Institute for Environmental Sciences in Japan.

Large numbers of people of all age groups are increasingly exposed to ionizing radiation from various sources. Many receive chronic occupational exposure from nuclear technologies or airline travel. The use of medical diagnostics and therapeutic radiology has increased rapidly – for example more than 62 million CT scans per year are currently carried out in USA.

Approximately one third of all diagnostic CT examinations are scans of the head region.

– All these kinds of exposures are low dose and as long as we talk about one or a few exposures in a lifetime I do not see cause for concern. What concerns me is that modern people may be exposed several times in their lifetime and that we don’t know enough about the consequences of accumulated doses, says Stefan J. Kempf.

Recent data suggest that even relatively low radiation doses, similar to those received from a few CT scans, could trigger molecular changes associated with cognitive dysfunction.

In their new study, the researchers have elucidated molecular alterations in the hippocampus of mice. The hippocampus is an important brain region responsible for learning and memory formation and it is known to be negatively affected in Alzheimer´s.

The authors induced changes in the hippocampus by two kinds of chronic low-dose-rate ionizing radiation treatments. The mice were exposed to cumulative doses of 0.3 Gy or 6.0 Gy given at low dose rates of 1 mGy over 24 hours or 20 mGy over 24 hours for 300 days.

– Both dose rates are capable of inducing molecular features that are reminiscent of those found in the Alzheimer’s disease neuropathology, says Stefan J. Kempf.

When a patient gets a head scan, the doses varies between 20 and 100 mGy and lasts for around one minute. When a person flies, he or she gets exposure to ionising radiation coming from space but the rates are by far smaller than a CT scan.

– When you compare these figures you will find that we exposed the mice to a more than 1000 times smaller cumulative dose than what a patient gets from a single CT scan in the same time interval. And even then we could see changes in the synapses within the hippocampus that resemble Alzheimer´s pathology.

According to Stefan J. Kempf, the data indicate that chronic low-dose-rate radiation targets the integration of newborn neurons in existing synaptic wires.

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Paper: Chronic low-dose-rate ionising radiation affects the hippocampal phosphoproteome in the ApoE?/? Alzheimer mouse model. Forfattere: Stefan Kempf, Dirk Janik, Zarko Barjaktarovic, Ignacia Braga-Tanaka III, Satoshi Tanaka, Frauke Neff, Anna Saran, Martin Røssel Larsen, Soile Tapio. OncoTarget, 20. september 2016.

https://www.eurekalert.org/pub_releases/2016-10/uosd-ctr102716.php

October 29, 2016 Posted by | radiation | , , | 1 Comment

Causal connection between nuclear radiation and Alzheimers’ Disease – European research

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Concern that radiation may contribute to development of Alzheimer’s https://www.eurekalert.org/pub_releases/2016-10/uosd-ctr102716.php  UNIVERSITY OF SOUTHERN DENMARK MORE HUMANS THAN EVER ARE EXPOSED TO HIGHER LEVELS OF IONIZING RADIATION FROM MEDICAL EQUIPMENT, AIRPLANES, ETC. A NEW STUDY SUGGESTS THAT THIS KIND OF RADIATION MAY BE A CONFOUNDING FACTOR IN THE NEURODEGENERATIVE DISEASE ALZHEIMER´S.

Alzheimer’s disease is the leading cause for dementia in the elderly, and its global prevalence is supposed to increase dramatically in the following decade – up to 80 million patients by 2040.

– It is crucial that we investigate the potential factors behind this disease, says postdoc Stefan J. Kempf, University of Southern Denmark. His research focuses on possible connections between radiation and cognitive impairments.

In a new study, he and an international consortia involving colleagues from Italy, Japan, Germany and Denmark show that low doses of ionising radiation induce molecular changes in the brain that resemble the pathologies of Alzheimer’s. Continue reading

October 27, 2016 Posted by | health, radiation | Leave a comment

Radiation-absorption tests under development could save lives in nuclear explosion

Direct measurement (like Becquerels) via blood samples described in the article sounds like the way to go.

The key to understand is that this is something that has never existed and we hope it never gets used,” Josh LaBaer, principal investigator and director of the Biodesign Institute at Arizona State University, told Homeland Preparedness News.

The tests could also have civilian applications as well, LaBaer said, such as in the event of industrial accidents at a nuclear power plant or in medical situations when people are exposed to excessive radiation.

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The U.S. government is funding the late-stage development of tests that would quickly determine how much radiation a person has absorbed in the event of a catastrophic nuclear explosion.

The U.S. Department of Health and Human Services’ Office of the Assistant Secretary for Preparedness and Response (ASPR) is sponsoring the development of tests that go beyond detecting whether radiation is on a person’s skin to determining the amount of radiation that has been absorbed into a person’s body.

The key to understand is that this is something that has never existed and we hope it never gets used,” Josh LaBaer, principal investigator and director of the Biodesign Institute at Arizona State University, told Homeland Preparedness News.

ASPR’s Biomedical Advanced Research and Development Authority (BARDA) will provide more than $21.3 million over four years to develop the tests. Kansas City, Missouri-based MRIGlobal said in a written statement the contract could be extended for up to $100 million over 10 years.

MRIGlobal is partnering with Thermo Fisher Scientific and Arizona State University to lead the development of the program for BARDA. The agency also will provide more than $22.4 million in funding over two years to DxTerity Diagnostics based near Los Angeles.

The challenge was that in the event of a nuclear bomb in a major American city, there is an instantaneous release of high doses of gamma radiation, which is the type of radiation that travels through the air over large distances,” LaBaer said. “In that type of mass casualty event there would be lots of people who would need to be evaluated.”

The task for researchers was to develop a device that could quickly measure how much radiation large numbers of people had potentially absorbed into their organs and blood cells during a nuclear emergency. Devices currently available today can only detect radiation on the skin.

The amount of radiation that gets absorbed into the body has a direct implication on how that person gets triaged and managed,” LaBaer said. Absorption of a small or moderate dose of radiation could require medication, while a larger dose could require hospitalization and a potential bone marrow transplant.

BARDA is supporting development of the tests with the goal of potentially purchasing them from one or more of the companies for the Strategic National Stockpile.

After a six-year effort, the university has developed the ASU radiation (ARad) biodosimetry test, which would generate results in about eight hours and could be used on people who were exposed to radiation up to seven days after the event. HHS said the potential exists where 400,000 or more tests could be processed a week.

In the test, a blood sample is taken to isolate the white blood cells in order to collect the genes that have been exposed to radiation. Certain genes are more predictive when it comes to determining the amount of radiation the body was exposed to.

We were looking for the smallest number of genes we could use but that still were accurate in predicting dose depending on the time after the event,” LaBaer said.

Work to date has been based on animal studies and developing conversion factors to transfer to humans.

The tests could also have civilian applications as well, LaBaer said, such as in the event of industrial accidents at a nuclear power plant or in medical situations when people are exposed to excessive radiation.

https://homelandprepnews.com/featured/20018-radiation-absorption-tests-development-save-lives-nuclear-explosion/

October 24, 2016 Posted by | radiation | , , | Leave a comment