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Airborne radiation near Fukushima nuke plant still far higher than gov’t max

Capture du 2018-01-18 17-22-25.png
In this July 27, 2017 file photo, contaminated water storage tanks are seen on the Fukushima No. 1 nuclear plant grounds, in Okuma, Fukushima Prefecture.
Airborne radiation in “difficult to return” zones around the Fukushima No. 1 nuclear plant was as high as around 8.48 microsieverts per hour as of summer last year, according to data presented by the government nuclear watchdog on Jan. 17.
The Nuclear Regulation Authority (NRA) released the results of the July-September 2017 measurements at a regular meeting on the day. The highest reading was taken in Futaba, Fukushima Prefecture — one of the municipalities hosting the Fukushima No. 1 plant.
Following the March 2011 triple meltdown, the government set a long-term radiation exposure limit of 1 millisievert per year, which breaks down to an hourly airborne radiation dose of 0.23 microsieverts.
The NRA took airborne radiation readings in the Fukushima Prefecture towns of Futaba, Okuma, Namie and Tomioka, and the village of Katsurao. The highest reading registered in the previous year’s survey was 8.89 microsieverts per hour, in Katsurao.
Some of the NRA members at the Jan. 17 meeting pointed to study results showing that human exposure doses are relatively small compared to airborne doses. Regarding the calculation that an annual dose of 1 millisievert is equivalent to hourly exposure of 0.23 microsieverts, NRA Chairman Toyoshi Fuketa stated, “That was decided right at the start of the nuclear disaster, so it can’t be helped that it’s a cautious number.” He added, “If we don’t revise (that calculation) properly, it could hinder evacuees’ return home.”

January 18, 2018 - Posted by | Fukushima 2018 | , ,

1 Comment »

  1. This is 74.3 mSv per yr: 8.48 microsieverts x 24 x 365 divided by 100.

    74.3 mSv external low LET rad hazard, according to the conservative estimate of US gov BEIR, results in an almost 1% chance of life shortening cancer from this exposure alone. Over 10 years this would be 7%. According to BEIR, 100 mSv exposure for external low-LET rad results in an excess cancer risk of 1-3%. This is apart from inhalation and ingestion. This is apart from high LET exposure. A newer study suggests risk is 15% or greater per 100 mSv.

    Some old watches have this level (e.g. Bulova) from radium. Radium clocks, watches, and other uses helps to account for many of the cancers in the 20th century and has helped to mask the hazards of nuclear, as radium use predates the nuclear age. Until around 1900 there was almost no cancer, even though the US actually kept surprisingly good records. One main cancer was stomach cancer which could be from uranium dyes in plates or radium in water or ingested during mining activities. Historic cancers in nuns may be accounted for due to kneeling so frequently on granite floors and altars or “healing” springs.

    Comment by miningawareness | January 20, 2018 | Reply

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