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Abstract
In order to study the migration behavior of 137Cs adsorbed on fine soil particles, distilled water was introduced into the unsaturated sandy soil column which filtrated the fine soil particles. From the concentrations of 137Cs in the effluent and in the soil column, it was found that fine soil particles filtrated by the soil layer were re-suspensible at the surface of soil layer and the amount of re-suspension per unit time was in proportion to the amount of filtrated fine soil particles. Considering the filtration of fine soil particles by soil layer, the reaction between soil layer and fine soil particles on which 137Cs is adsorbed is described by the formula ∂Q/∂t = K1C--K2Q at the surface of soil layer. Good agreement was obtained between the observed 137Cs concentration in the effluent and the predicted one employing ∂Q/∂t = K1C-K2Q and ∂Q/∂t = K1C as a reaction formula at the surface of soil layer and in the subsurface part of the soil layer, respectively.