Fujimura Shigeto, Muramatsu Yasuyuki, Ohno Takeshi, Saitou Masaaki, Suzuki Yasukazu, Kobayashi Tomoyuki, Yoshioka Kunio, Ueda Yoshikatsu
Fukushima Agricultural Technology Centre, 116 Shimonakamichi, Takakura-Aza, Hiwada-machi, Koriyama, Fukushima 963-0531, Japan.
Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan.
J Environ Radioact. 2015 Feb;140:59-64. doi: 10.1016/j.jenvrad.2014.10.018. Epub 2014 Nov 25.
The ability to predict radiocesium transfer from soil to agricultural products is necessary for assessing management options in a radiocesium contaminated area. In this study, we evaluated the differences in transfer factors among soil samples and the differences in transfer factors between the first and the second years of contamination in rice. We employed pot experiments using four types of soils that are representative of the agricultural soils present in the Fukushima Prefecture contaminated by (137)Cs released from the Fukushima Dai-ichi Nuclear Power Plant after the March 2011 accident. The experiments were conducted during the 2011 and 2012 growing seasons. The geometric mean of transfer factors for brown rice and inedible rice part was 0.011 and 0.031, respectively, in 2011 and 0.0061 and 0.020, respectively, in 2012. The average decreasing rate of the transfer factor was 40% and 30% in brown rice and inedible rice part, respectively, from 2011 to 2012, presumably owing to the irreversible sorption of (137)Cs to clay minerals.
预测放射性铯从土壤向农产品转移的能力对于评估放射性铯污染地区的管理方案是必要的。在本研究中，我们评估了土壤样品间转移因子的差异以及水稻受污染第一年和第二年转移因子的差异。我们使用了盆栽试验，所用的四种土壤代表了2011年3月事故后受福岛第一核电站释放的(137)Cs污染的福岛县的农业土壤。试验在2011年和2012年生长季节进行。2011年糙米和水稻不可食用部分转移因子的几何平均值分别为0.011和0.031，2012年分别为0.0061和0.020。从2011年到2012年，糙米和水稻不可食用部分转移因子的平均下降率分别为40%和30%，这可能是由于(137)Cs不可逆地吸附到粘土矿物上。
