著者

Kazuhiro Shiba

出版者

日本放射線安全管理学会

雑誌

Radiation Safety Management (ISSN:13471511)

巻号頁・発行日

vol.12, no.1, pp.31-36, 2013 (Released:2013-04-12)

参考文献数

2

被引用文献数

1 1

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Huge amounts of radioactivity derived from the Fukushima nuclear accident were scattered in the atmosphere. Various kinds of vegetables in three prefectures in the Tohoku area were contaminated with 131I and 137Cs over the legal limit for shipment. A simple and effective removal method for contaminated farm products was developed to ensure the relief of farmers and the security of consumers. Distribution imaging of radioactivity in the contaminated vegetables, the physical removal of radioactivity from contaminated vegetables and the chemical removal of radioactivity from contaminated vegetables were examined. As a result, there were two types of vegetable contamination, spot type or spread type. The concentration of radioactivity was higher on the outer side than the inner side of a vegetable leaf. More than 80% of radioactivity attaches to the surface of leaves. Radioactivity removal by water washing showed no significant difference between boiling water and cold water. There was no significant difference between hand-washing and running water washing. The radioactivity of vegetables decreased by 70-80% for 131I and more than 80% for 137Cs by reducing agent treatments. In particular, ascorbic acid is promising as a safe and versatile option.