TERRAPUB Geochemical Journal
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Geochemical Journal, Vol. 46 (No. 1), pp. 73-76, 2012

NOTE

Vertical profiles of Iodine-131 and Cesium-137 in soils in Fukushima Prefecture related to the Fukushima Daiichi Nuclear Power Station Accident

Kazuya Tanaka,1 Yoshio Takahashi,2 Aya Sakaguchi,2 Miyuki Umeo,2 Shinjiro Hayakawa,3 Hajime Tanida,4 Takashi Saito5 and Yutaka Kanai6

1Institute for Sustainable Sciences and Development, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8530, Japan
2Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
3Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan
4Office of Society-Academia Collaboration for Innovation, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan
5Fukushima Agricultural Technology Centre, Hiwada, Koriyama, Fukushima 963-0531, Japan
6Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan

(Received August 4, 2011; Accepted October 11, 2011)

Abstract: Vertical profiles of iodine-131 and cesium-137 emitted from the Fukushima Daiichi Nuclear Power Station were determined in soil core samples collected in Fukushima prefecture. The profiles showed that more than 76% of the radionuclides were retained within 5 cm of the surface. Leaching experiments showed that cesium was strongly bound to soil particles which could not be leached with 2 M HCl, while more than 40% of iodine was incorporated into humic substances.
Key words: Iodine-131, Cesium-137, clay minerals, humic substances, Fukushima


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