Radionuclide migration tests have been carried out by using aquifer soil samples from coastal sand and loamy soil layers as a part of environmental safety research on shallow land disposal of low level radioactive wastes.
The barrier ability of aquifer soil to radionuclide migration was confirmed by the fact that each radionuclide was mostly adsorbed on soil nearby the inflow point of radioactive solution. In aquifer soil sample from loamy soil layer, especially, each radionuclide hardly migrates to downstream.
In order to evaluate the distribution of low concentration portion, it is necessary to develop the transport equation considering particulate moving mechanism to express the migration accurately, because
60Co is detected in effluent and
137Cs is detected in residue of filtration.
Distribution pattern of radionuclide concentration in the soil is compared with calculated one where the transport equation based on distribution coefficient is used. As to the distribution of high concentration portion, distribution of
137Cs is in roughly agreement with calculated one on aquifer soil sample from coastal sand layer.
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