Radionuclide migration experiments under in situ conditioons

摘要

In virtually all concepts for the disposal of high level wastes, one of the roles of the grosphere is to serve as a natural barrier to radionuclide migration by impeding or retarding the movement of any radionuclides released from the waste to the biosphere. Retardation of radionuclide transport results from the interaction of dissolved radionuclides with the minerals present in fractures that form flow paths for the groundwater and with the surfaces of the interconnected pore space in the rock matrix surrounding a disposal vault. This interaction is usually reporesented numerically by a sorption coefficient that expresses sorption as a ratio between the concentrations of a radionuclide sorbed on a surface to that remaining in solution.