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Report No.

The Result of radionuclide concentrations in fallout around Tokai Reprocessing Plant after Fukushima Daiichi Nuclear Power Plant accident

Nagaoka, Mika; Fujita, Hiroki; Nakano, Masanao; Watanabe, Hitoshi; Sumiya, Shuichi

Monthly deposition samples were collected in the NCL which is located at about 115km south of the Fukushima Daiichi NPP, and the radioactive nuclides were analyzed. Although radionuclides such as $$^{131}$$I (T$$_{1/2}$$=8.02 days), $$^{129m}$$Te-$$^{129}$$Te (T$$_{1/2}$$=33.6 days) and $$^{132}$$Te-$$^{132}$$I (T$$_{1/2}$$=3.2 days) with $$^{134}$$Cs and $$^{137}$$Cs were observed by $$gamma$$ spectrometry at the early time of the Fukushima Daiichi NPP accident, only $$^{134}$$Cs and $$^{137}$$Cs were detected as of September 2012. The annual deposition of $$^{134}$$Cs and $$^{137}$$Cs were about 19,000 and 17,000 Bq/m$$^{2}$$, respectively in March 2011 - February 2012 after the accident. Moreover, $$^{90}$$Sr was detected in some samples. Monthly $$^{90}$$Sr deposition in March 2011 was 5.1 Bq/m$$^{2}$$ month and then decreased after that. On the other hand, $$^{239,240}$$Pu concentration was the same level with the concentration before the accident.



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