UIS Commission on Karst Hydrogeology and Speleogenesis
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Glossary of Karst and Cave Terms

radionuclide retardation
The process or processes that cause the time required for a given-radionuclide to move between two locations to be greater than the ground-water travel time, because of physical and chemical interactions between the radionuclide and the geohydrologic unit through which the radionuclide travels [22].