A model of multicomponent ion exchange is developed in order to estimate effects of coexisting ions in groundwater such as Ca and Mg on radionuclide migration.
This model well estimated following experimental results for Sr-Ca-Mg system.
(1) Breaktimes of Sr are drastically reduced due to coexistence of Ca and Mg.
(2) Peak height of effluent concentration of Ca reached level about 2 times larger than initial concentration of Ca. This overshoot effect is caused by additional Ca newly leached from the sand.
Above phenomena are considered to be observed more or less at any soil environment which is in contact with underground water for a long time. The model of multicomponent ion exchange proposed seems to be therefore effective tool for safety assessment of shallow land burial of low level radioactive waste.
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