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Report No.
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Migration of actinides and fission products in environments

Onuki, Toshihiko

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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