Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 66(7): 235-242 (2017)


ダイズ子実中のセシウムの濃度分布The Concentration Distributions of Cs in Soybean Seeds

1東京大学大学院農学生命科学研究科Graduate School of Agricultural and Life Sciences, The University of Tokyo ◇ 113–8657 東京都文京区弥生1–1–1 ◇ 1–1–1 Yayoi, Bunkyo-ku, Tokyo 113–8657, Japan

2京都大学生存圏研究所Research Institute for Sustainable Humanosphere, Kyoto University ◇ 611–0011 京都府宇治市五ケ庄 ◇ Gokasho, Uji-shi, Kyoto 611–0011, Japan

3京都大学化学研究所Institute for Chemical Research, Kyoto University ◇ 611–0011 京都府宇治市五ケ庄 ◇ Gokasho, Uji-shi, Kyoto 611–0011, Japan

4大阪府立産業技術総合研究所Osaka Research Institute of Industrial Science and Technology ◇ 594–1157 大阪府和泉市あゆみ野2–7–1 ◇ 2–7–1 Ayumino, izumi-shi, Osaka 594–1157, Japan

受付日:2016年6月12日Received: June 12, 2016
受理日:2017年3月8日Accepted: March 8, 2017
発行日:2017年7月15日Published: July 15, 2017


Radioactive materials, primarily radiocaesium (134Cs+137Cs), were released into the environment by the Fukushima Dai-ichi Nuclear Power Plant accident in March 2011. The proportion of the soybean plants that had an activity concentration of radiocaesium over 100 Bq/kg was higher than that of other crops. To examine the reason why the activity concentration of radiocaesium in soybeans was higher, the concentration distributions of Cs in soybean seeds were analyzed using two methods, X-ray fluorescence microscopy and radioluminography with 137Cs. Moreover, the Cs concentration of each organ and the ratio of absorbed Cs to seeds in matured soybeans were examined. The results of the two experiments show that Cs was uniformly distributed in the soybean seeds, as was potassium, both of which likely accumulated in the cotyledon. In addition, approximately 40% of absorbed Cs was accumulated in the soybean seeds. Conversely, it is reported that rice accumulates Cs only in part of its grain and that the accumulation in the grain is lower than that in soybeans. It has been suggested that soybean seeds have a large capacity for Cs accumulation, and this is one of the reasons why the activity concentrations of radiocaesium in soybeans are higher than that in other crops.

Key words: radiocaesium; radioluminography; soybean; X-ray fluorescence microscopy

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