The Result of Radionuclide Concentrations in Fallout around Tokai Reprocessing Plant after Fukushima Daiichi Nuclear Power Plant Accident

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  • NAGAOKA Mika
    Radiation Protection Department, Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency
  • FUJITA Hiroki
    Radiation Protection Department, Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency
  • NAKANO Masanao
    Radiation Protection Department, Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency
  • WATANABE Hitoshi
    Radiation Protection Department, Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency
  • SUMIYA Shuichi
    Radiation Protection Department, Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency

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  • 東海再処理施設周辺における東電福島第一原発事故後の降下じん中放射性物質濃度調査結果
  • トウカイ サイショリ シセツ シュウヘン ニ オケル トウデン フクシマ ダイイチ ゲンパツ ジコ ゴ ノ コウカジンチュウ ホウシャセイ ブッシツ ノウド チョウサ ケッカ

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Abstract

Monthly deposition samples were collected at the Nuclear Fuel Cycle Engineering Laboratories located about 115 km south of the Fukushima Daiichi Nuclear Power Plant (NPP), and the radioactive nuclides were analyzed. Although radionuclides such as 131I, 129mTe-129Te and 132Te-132I with 134Cs and 137Cs were observed by gamma spectrometry at the early time of the Fukushima Daiichi NPP accident, only 134Cs and 137Cs were detected as of September 2011. The annual depositions of 134Cs and 137Cs were about 19,000 and 17,000 Bq m-2, respectively in March 2011-February 2012 after the accident. Moreover, 90Sr was detected in some samples. Monthly 90Sr deposition in March 2011 was 5.1 Bq m-2 month-1 and then decreased after that. On the other hand, 239, 240Pu concentration was the same level with the concentration before the accident.

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