Decay-Series Disequilibrium Study of In Situ Long-Term Radionuclide Transport in Water-Rock Systems


Uranium and thorium-series disequilibrium in nature permits the determination of many in-situ physico-chemical, geologic and hydrologic variables that control the long-term migration of radionuclides in geologic systems. It also provides site-specific, natural analog information valuable to the assessment of geologic disposal of nuclear wastes. In this study, a model that relates the decay-series radioisotope distributions among solution, sorbed and solid phases in water-rock systems to processes of water transport, sorption-desorption, dissolution-precipitation, radioactive ingrowth-decay, and α recoil is discussed and applied to a basaltic aquifer at the Idaho National Engineering and Environmental Laboratory (INEEL), Idaho.

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Correspondence to Shangde Luo.

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Luo, S., Ku, TL., Roback, R. et al. Decay-Series Disequilibrium Study of In Situ Long-Term Radionuclide Transport in Water-Rock Systems. MRS Online Proceedings Library 608, 217 (1999).

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