Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 69(11): 353-364 (2020)


東京電力福島第一原子力発電所事故由来のI-131及び放射性セシウムの葉菜類のウェザリング半減期の主要因に関する考察(2)チェルノブイリ原発事故後における草本植物ウェザリング半減期との比較Major Factors Affecting Weathering Half-lives of Iodine-131 and Radiocaesium in Leafy Vegetables Directly Contaminated by Fukushima Dai-ichi Nuclear Power Plant Accident Fallout(2) Comparison of the Weathering Half-Lives Observed for Herbaceous Plants After the Chernobyl and the Fukushima Nuclear Accidents

量子科学技術研究開発機構量子医学・医療部門放射線医学総合研究所National Institutes for Quantum and Radiological Science and Technology, Quantum Medical Science Directorate, National Institute of Radiological Sciences

受付日:2020年5月15日Received: May 15, 2020
受理日:2020年8月5日Accepted: August 5, 2020
発行日:2020年11月15日Published: November 15, 2020

福島第一原発事故直後の葉菜類のウェザリング半減期(Tw)と比較するために,チェルノブイリ原発事故後に日本で測定された草本植物中の放射性核種濃度の文献データからTwを導出した。Twの幾何平均値は131Iが19.1 d, 137Csが18.4 dであり,核種間に有意差はなかった。福島第一原発事故後のTwは,チェルノブイリ原発事故後の日本のTwに比べて両核種とも有意に短かったが,ヨーロッパ諸国のTwとは同程度であった。

To compare weathering half-life (Tw) values of radionuclides in leafy vegetables observed just after the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, we carried out literature survey to calculate Tw values from time-dependent radioactivity concentration data in Japanese herbaceous plants observed after the Chernobyl Nuclear Power Plant (ChNPP) accident. The geometric mean Tw value for 131I was 19.1 d and that for 137Cs was 18.4 d for herbaceous plants in Japan after the ChNPP accident; no significant difference was observed between the Tw values of these radionuclides. When Tw values obtained after the FDNPP accident were compared with those obtained after the ChNPP accident in Japan, the values were significantly shorter for both radionuclides; however, Tw values from the FDNPP accident were similar to those from the ChNPP accident obtained in European countries including Russia.

Key words: literature survey; radionuclide deposition pattern; effective half-life; mugworts; agricultural crops

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