Abstract
The migration behavior of radionuclides (60Co, 85Sr and 137Cs) in aquifer has been studied under a steady flow of water by using aquifer model apparatus. In the portion of high concentration (≧ 10−3 μCi/g), water flow has slight influence on migration of these radionuclides. On the other hand, in the portion of low concentration (10−4 μCi/g), 60Co and 137Cs are particularly influenced by the flow, but the migration of 85Sr is relatively small. Such phenomena support that the migration of 85Sr is subject to the ion exchange reaction, and the migration of 60Co and 137Cs may be due to both ion exchange reaction and particulate moving mechanism. The concentration distribution observed is compared with that of the calculation by predicting equation based on ion exchange reaction. In the distribution of high concentration portion, the observed on each radionuclide is almost same as to the calculated, but in the distribution of low concentration portion, both observed on 60Co and 137Cs are very different from the calculated. Since migration behavior of 60Co and 137Cs cannot be described by predicting equation only based on ion exchange reaction, it is, therefore, necessary to predict those migration by the equation consisting of ion exchange reaction and particulate moving mechanism.
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