Aquifer transport of Th, U, Ra, and Rn in solution and on colloids. 1998 annual progress report

'The investigation focuses on understanding the behavior of naturally occurring U, Th, Ra, and Rn isotopes in groundwater along with the supply rates of these isotopes by rock alteration, and utilizing these species as natural analogues for waste radionuclides, thereby providing a basis for predicting contaminant migration behavior in potentially impacted aquifers. The study examines the fundamental controls on natural radionuclide transport in specific aquifers by integrating aquifer sample analyses, focused laboratory experiments, field observations, and theoretical modeling.