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Vertical distribution of $$^{90}$$Sr and $$^{137}$$Cs in soils near the Fukushima Daiichi Nuclear Power Station

福島第一原子力発電所近傍の土壌中におけるCs-137, Sr-90の深度分布

佐々木 隆之*; 的場 大輔*; 土肥 輝美  ; 藤原 健壮 ; 小林 大志*; 飯島 和毅 

Sasaki, Takayuki*; Matoba, Daisuke*; Dohi, Terumi; Fujiwara, Kenso; Kobayashi, Taishi*; Iijima, Kazuki

The radioactivity concentrations for $$^{90}$$Sr and $$^{137}$$Cs in soil samples collected near Fukushima Daiichi Nuclear Power Station were investigated. The depth profile of $$^{137}$$Cs from the surface soil to 20 cm showed a typical decreasing tendency, that is, high radioactivity from the surface down to 5 cm due to the strong sorption of specific minerals. After deposition of $$^{90}$$Sr, $$^{90}$$Sr has migrated to deeper soil layers in the past 5 years compared to $$^{137}$$Cs. This tendency was supported by the results of sequential extraction to identify the predominant sorption species, and by the sorption coefficients determined by batch-wise sorption experiments.

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分野:Chemistry, Analytical

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