Evaluation of water flow velocity, dispersion length and retardation factor in radionuclide migration test using undisturbed samples of aerated sandy soil layer

The water flow velocity, dispersion length and retardation factor were determined from the result of the migration tests using the soil layer samples which were collected from a natural aerated sandy soil layer without any disturbance. Each value was compared with that estimated from the soil characteristics and the experimental conditions. Though the values of dispersion length in the tests were nearly the same as those estimated from the soil characteristics, the values of water flow velocity in the tests were slightly larger than those estimated from the soil characteristics and the experimental conditions. Though the values of the retardation factor of 137Cs were nearly the same as those estimated from the soil characteristics, the values for 60Co and 85Sr were several time or even scores of times larger than those estimated from the soil characteristics. (author)