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Long-term mobility of uranium in the granitic KURT site using isotopic analysis and sequential chemical extraction

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Abstract

In this study, the long-term mobility of natural uranium in the KAERI Underground Research Tunnel (KURT) site was investigated using sequential chemical extraction and isotopic analyses of natural uranium in granite. It was found that uranium(VI) would be leached out due to preferential leaching of 234U relative 238U and concentrated by an uraniferous enrichment process through long-term interactions with the oxic KURT groundwater. Our results also suggest that the migration of the preferentially released uranium(VI) through fractured granite can be significantly retarded by secondary mineral phases formed by the weathering processes of granite.

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Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) funded by the Korean government, Ministry of Science and ICT, through two research projects (Grant Nos. 2017M2A8A5014859 and 2017M2B2B1072407).

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  1. Korea Atomic Energy Research Institute, 989-111 Daedeokdae-Ro, Yuseong-Gu, Daejeon, 34057, Republic of Korea

    Min Hoon Baik & Jae Kwang Lee

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Correspondence to Min Hoon Baik.

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Baik, M.H., Lee, J.K. Long-term mobility of uranium in the granitic KURT site using isotopic analysis and sequential chemical extraction. J Radioanal Nucl Chem 326, 1173–1183 (2020). https://doi.org/10.1007/s10967-020-07380-6

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