Migration Behavior of Radionuclides (60Co, 85Sr and 137Cs) in Aerated Sandy Soil LayerDifference of Migration Behavior and Desorption Process for Radionuclides

摘要

Differences of the migration behavior and desorption process for radionuclides (60Co, 85Sr and 137Cs) in aerated sandy soil layer were studied by sprinkle of distilled water into the contaminated soil with above nuclides in column. Influence of difference desorption process on radionuclide migration was examined by changing the volume of distilled water sprinkled like rain on the contaminated soil. Quantity of sprinkled water affected the concentration distribution of each radionuclide in soil layer. Each nuclide migrated deeper in the layer according to the increase of water amount, and especially, migration behavior of 85Sr was remarkably influenced by water amount. It is observed that as to 85Sr maximum contamination part in soil layer moved to deeper layer with increase of water amount, and that, as to 60Co and 137Cs, it moved almost never. On the other hand, activity concentration of 60Co or 137Cs in effluent was rather high (10-6 μCi/ml) compared with that of 85Sr, which could not be detected therein.