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Migration of actinides and fission products in environments

アクチノイドと核分裂生成物の環境中における移行

大貫 敏彦

Onuki, Toshihiko

土壌中の放射性Csの化学状態を脱離試験により調べた。その結果、塩化アンモニウムや酢酸溶液により脱離されない放射性Csが65%以上あった。これらの放射性Csは雲母以外の鉱物,モンモリロナイト,モルデナイト,カオリナイト,マンガン酸化物などにも固定されていることを明らかにした。

Chemical states of radioactive Cs in the contaminated soils by FDNPP accident has been characterized by the desorption experiments using appropriate reagents solutions and size fractionation of the contaminated soils. More than 65% of radioactive Cs were remained in the residual fraction of the soil samples after treatment of a 1 mole/L NH$$_{4}$$Cl solution and a 1 mole/L CH$$_{3}$$COOH solution. We have found that non mica like minerals montmorillonite, mordenite, kaolinite, and MnO$$_{2}$$ contributed to the fixation of the radioactive cesium fall-out on Fukushima soil, when the concentration of Cs is low.

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