Abstract
This paper provides an overview and information on radon migration in the crust. In the past several decades, numerous studies on radon migration have been published. However, there is no there is no comprehensive review of large-scale radon transport in the earth crust. A literature review was conducted to present the research on the mechanism of radon migration, geogas theory, investigation of multiphase flow, and modeling method of fractures. Molecular diffusion was long considered the primary mechanism for radon migration in the crust. However, a molecular diffusion mechanism cannot explain the understanding of anomalous radon concentrations. In contrast with early views, the process of radon migration and redistribution within the Earth may be determined by geogas (mainly CO2 and CH4). Microbubbles rising in fractured rocks may be a rapid and efficient way of radon migration, as reported by recent studies. All these hypotheses on the mechanisms of geogas migration are summarized into a theoretical framework, defined as “geogas theory.” According to geogas theory, fractures are the principal channel of gas migration. The development of the discrete fracture network (DFN) method is expected to supply a new tool for fracture modeling. It is hoped that this paper will contribute to a deeper understanding of radon migration and fracture modeling.
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The authors wish to thank the assistance provided in the laboratory.
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This work was supported by the National Natural Science Foundation of China (grant numbers 11705083), Foundation project in the field of Equipment Advance Research (grant number 80927015101), Natural Science Foundation of Hunan Province (grant number 2019JJ50488), and Science and Technology Innovation Project of Hengyang (grant number 202105006).
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Chen, ., Liu, Y., Jiang, Y. et al. Radon transport carried by geogas: prediction model. Environ Sci Pollut Res 30, 86656–86675 (2023). https://doi.org/10.1007/s11356-023-28616-4
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DOI: https://doi.org/10.1007/s11356-023-28616-4