McKinley and Alexander (1996) criticized the model formulation of Ku et al. (1992) that described the use of naturally occurring U-Th series disequilibria in rock-water systems for evaluating the in situ retardation of radionuclide migration. Many of these criticisms appear to result from a misunderstanding of the model development and the formulation of the rock-water exchange terms. We present a clarification of the issues they have raised.
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