Prediction of groundwater contamination with ¹³⁷Cs and ¹³¹I from the Fukushima nuclear accident in the Kanto district

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• 作者：Tomoko Ohta^a ; ^{tomoohta@eng.hokudai.ac.jp} ; Yasunori Mahara^b ; Takumi Kubota^b ; Satoshi Fukutani^b ; Keiko Fujiwara^b ; Koichi Takamiya^b ; Hisao Yoshinaga^b ; Hiroyuki Mizuochi^c ; Toshifumi Igarashi^a
• 关键词：Cesium-137 ; Environmental radioactivity ; Fukushima nuclear accident ; Iodine-131 ; Rainwater
• 刊名：Journal of Environmental Radioactivity
• 出版年：2012
• 期刊代码：45_0265931x
• 类别：env
• 出版时间：September, 2012
• 卷：111
• 期：Complete
• 页码：38-41
• 文件大小：353 K

摘要

We measured the concentrations of ¹³¹I, ¹³⁴Cs, and ¹³⁷Cs released from the Fukushima nuclear accident in soil and rainwater samples collected March 30-31, 2011, in Ibaraki Prefecture, Kanto district, bordering Fukushima Prefecture to the south. Column experiments revealed that all ¹³¹I in rainwater samples was adsorbed onto an anion-exchange resin. However, 30%of ¹³¹I was not retained by the resin after it passed through a soil layer, suggesting that a portion of ¹³¹I became bound to organic matter from the soil. The ¹³⁷Cs migration rate was estimated to be approximately 0.6聽mm/y in the Kanto area, which indicates that contamination of groundwater by ¹³⁷Cs is not likely to occur in rainwater infiltrating into the surface soil after the Fukushima accident.