Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 68(1): 13-18 (2019)


原子力発電所事故後の福島県における放射性セシウムの耕作後の土壌中の深度分布と放射性セシウムの米への取り込みの年度による違いDepth Distribution of Radioactive Caesium in Soil after Cultivation and the Difference by Year of the Uptake of Radioactive Caesium in Rice in Fukushima Prefecture after the 2011 Nuclear Accident

1広島大学大学院フェニックスリーダー育成プログラム環境保全コースRadioactivity Environmental Protection Course, Phoenix Leader Education Program, Hiroshima University ◇ 739–8524 東広島市鏡山 1–1–1 ◇ 1–1–1 Kagamiyama, Higashi-Hiroshima 739–8524, Japan

2広島大学大学院理学研究科化学専攻Department of Chemistry, Graduate School of Science, Hiroshima University ◇ 739–8526 東広島市鏡山 1–3–1 ◇ 1–3–1 Kagamiyama, Higashi-Hiroshima 739–8526, Japan

3広島大学自然科学研究支援開発センターNatural Science Center for Basic Research and Development, Hiroshima University ◇ 739–8526 東広島市鏡山 1–4–2 ◇ 1–4–2 Kagamiyama, Higashi-Hiroshima 739–8526, Japan

受付日:2017年12月22日Received: December 22, 2017
受理日:2018年8月30日Accepted: August 30, 2018
発行日:2019年1月15日Published: January 15, 2019


An investigation concerning the transfer of radioactive caesium from soil to ears of rice in the paddy fields of Fukushima after the Fukushima Dai-ichi Nuclear Power Plant accident has been carried out. Because the investigation in 2013 revealed relatively higher concentrations of radioactive 137Cs and 134Cs in the rice ears from one of the neighboring four contiguous fields, the aim of the present research carried out in 2014 and 2015 was to investigate the features of the paddy field where the contaminated rice ears were produced. It was revealed that the concentrations of radioactive 137Cs and 134Cs in the soil decreased with increasing depth, despite the fact that the cultivation was carried out in the preceding year. The Cs depth dependency was different among the fields. The 137Cs and 134Cs penetrated more deeply in the field where a relatively higher radioactive caesium concentration in ears of rice was observed. The difference depended on the variation of grain size distribution of soil, which affected the uptake of caesium in the rice ears. Four fields were cultivated in 2013 and 2014, although the upper two fields were not cultivated in 2015. Some locations showed relatively higher concentrations of radioactive 137Cs and 134Cs for rice ears in the two bottom fields in 2015, compared to the concentrations in 2013 and 2014, suggesting the possibility of a change of grain size distribution of soil.

Key words: depth dependence of radioactivity concentration; uptake of radioactive caesium in rice; difference of the uptake by year; Fukushima Dai-ichi Nuclear Power Plant Accident

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