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. 2013:3:2283.
doi: 10.1038/srep02283.

Activity concentrations of environmental samples collected in Fukushima Prefecture immediately after the Fukushima nuclear accident

Masahiro Hosoda  1 , Shinji Tokonami, Hirofumi Tazoe, Atsuyuki Sorimachi, Satoru Monzen, Minoru Osanai, Naofumi Akata, Hideki Kakiuchi, Yasutaka Omori, Tetsuo Ishikawa, Sarata K Sahoo, Tibor Kovács, Masatoshi Yamada, Akifumi Nakata, Mitsuaki Yoshida, Hironori Yoshino, Yasushi Mariya, Ikuo Kashiwakura
Affiliations

Activity concentrations of environmental samples collected in Fukushima Prefecture immediately after the Fukushima nuclear accident

Masahiro Hosoda et al. Sci Rep. 2013.

Abstract

Radionuclide concentrations in environmental samples such as surface soils, plants and water were evaluated by high purity germanium detector measurements. The contribution rate of short half-life radionuclides such as (132)I to the exposure dose to residents was discussed from the measured values. The highest values of the (131)I/(137)Cs activity ratio ranged from 49 to 70 in the environmental samples collected at Iwaki City which is located to the south of the F1-NPS. On the other hand, the (132)I/(131)I activity ratio in the same environmental samples had the lowest values, ranging from 0.01 to 0.02. By assuming that the (132)I/(131)I activity ratio in the atmosphere was equal to the ratio in the environmental samples, the percent contribution to the thyroid equivalent dose by (132)I was estimated to be less than 2%. Moreover, the contribution to the thyroid exposure by (132)I might be negligible if (132)I contamination was restricted to Iwaki City.

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Figures

Figure 1
Figure 1. The location of the environmental sampling points.
Sampling sites in Fukushima Prefecture were selected after considering their direction and distance from F1-NPS.
See this image and copyright information in PMC

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