Abstract
The retardation effect of radionuclides (RNs) is a key factor to comprehend the performance of the geological disposal system. Since natural rock includes various minerals, the physical and chemical properties are not spatially uniform. However, in general, the performance assessments ignore such heterogeneity. This study focused on the grain size of each mineral in granite, to consider the spatial distribution of retardation coefficients. In a grain size, the retardation coefficient was assumed to be uniform in this study. Through such heterogeneous media, the transport rates of cesium-135 ( 2.1× 106 y in half-life) have been numerically examined, using two-dimensional advection-dispersion equations. Here, the sorption data of each mineral in granite were quoted from the past report. The conclusions are summarized as follows: (1) Since the flow test limits the sorption onto biotite (taking the highest sorption-coefficient in the minerals of granite) in the flow paths, the flow test showed less sorption, ...
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