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Radioactive contamination in the Tokyo metropolitan area in the early stage of the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident and its fluctuation over five years

Fig 1. Sampling sites of soil samples.

Geographical distribution of the 134+137Cs precipitation referred to the aircraft monitoring results by the MEXT of Japan on December 16, 2011 [30]. Adapted from ‘Extension Site of Distribution Map of Radiation Dose, etc.’ (


The activity and inventory of radioactive material in the eastern part of Tokyo tended to be high… The radioactive plume with high 131I activity spread into the Tokyo metropolitan area…
Almost no public information about the radioactive contamination in the Tokyo metropolitan area and Kanto district had been shared…
The plume containing a large amount of radioactive material drifted into the Tokyo metropolitan area… where over 30 million residents live… [Publications] include almost no discussion of the fact that radioactive materials were carried into the Tokyo metropolitan area…
The contamination level was extremely high in a roadside ditch sludge in Kashiwa City…
The quantity of 134+137Cs deposited in the region studied was estimated… from values measured in the soil, it was estimated as 5.35 TBq…
High activities and inventories of the radionuclides were found in eastern Tokyo and northern Chiba… The contamination was even higher in the adjoining northern part of Chiba located east of Tokyo…
The results reveal that the Tokyo metropolitan area even now continues to be affected by radioactive contamination caused by the FDNPP accident…
Gordon Edwards, Ph.D, nuclear expert, 2017 (pdf): Intensive contamination extends over 200 km south – right down to the outskirts of Tokyo
IRSN, 2016 (pdf): Fukushima-Daiichi Accident: Main contamination events… Event of 14-16 March – This event is marked by turning winds and by a rainfall that generated significant contamination of the Japanese territory. On the evening of the 14th of March, a first radioactive plume was transported by winds towards the southwest… and reached the Tokyo area. At Tsukuba, 153 Bq/m3** were measured…
** 153 Bq/m3 = 153,000,000 uBq/m3 Cs-137 in Tsukuba after Fukushima vs. 1.2 uBq/m3 Cs-137 in Tsukuba before Fukushima (source) = 127,500,000 times higher Cs-137 after Fukushima

November 18, 2017 - Posted by | Fukushima 2017 | ,

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