Depth distribution of ¹³⁷Cs, ¹³⁴Cs, and ¹³¹I in soil profile after Fukushima Dai-ichi Nuclear Power Plant Accident

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• 作者：Hiroaki Kato ; ^{hiros980@ies.life.tsukuba.ac.jp} ; Yuichi Onda ; Mengistu Teramage
• 关键词：Fukushima Dai-ichi Nuclear Power Plant accident ; 137Cs ; 134Cs ; 131I ; Depth distribution ; Soil profile
• 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：59-64
• 文件大小：502 K

摘要

Soil, vegetation and other ecological compartments are expected to be highly contaminated by the deposited radionuclides after the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident triggered by a magnitude 9.0 earthquake and the resulting tsunami on 11 March 2011. However, there is no field measurement data on the depth distributions of radiocaesium and ¹³¹I concentrations in soil profile. In this study, the depth distribution of the deposited radionuclides in the cultivated soil profile was investigated in one of the most contaminated area after FDNPP accident. The result of this study demonstrated that greater than 86%of total radiocaesium and 79%of total ¹³¹I were absorbed in the upper 2.0聽cm in the soil profile. The relaxation mass depth (h₀) derived from the depth distribution of radiocaesium and ¹³¹I in the soil profile at the study site were 9.1聽kg聽m^鈭? and 10.4聽kg聽m^鈭?, respectively. The h₀ of ¹³⁷Cs in the studied soil profile was greater than those for the cultivated soils nearby the Chernobyl NPP. The positive relationship was found between clay content of topsoil and the h₀ of ¹³⁷Cs. However, further analysis is required to clarify the effect of clay content on the initial penetration depth of deposited ¹³⁷Cs in soil profile.