Migration Behavior of Cesium in Fresh and Fractured Granite.

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  • 新鮮な花こう岩および破砕花こう岩中におけるセシウムの移行
  • シンセン ナ カコウガン オヨビ ハサイ カコウガンチュウ ニ オケル セシウ

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Abstract

Sorption of radionuclides on fractured rocks are of importance to understand the migration behavior in crystalline rocks such as granite, in which fractured zones are likely to be major migration paths. In the present study, sorption of cesium on fractured granite was measured by batch and column sorption experiments, and compared with that on fresh granite.<BR>The distribution coefficients for fractured granite, obtained by the batch sorption experiments, were one to two orders in magnitude larger than those for fresh granite. The larger sorption in fractured zones implies that migration of elements in fractured zones could not be as significant as that expected by the higher groundwater velocity. The cesium migration through fresh granite-packed columns could be described by one-dimensional advection-dispersion equation, in which sorption equilibrium was attained.

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