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An integrated approach combining soil profile, records and tree ring analysis to identify the origin of environmental contamination in a former uranium mine (Rophin, France)

Abstract : Uranium mining and milling activities, raise environmental concerns due to the release of radioactive and other toxic elements. Their long-term management thus requires a knowledge of past events coupled with a good understanding of the geochemical mechanisms regulating the mobility of residual radionuclides. This article presents the results on the traces of anthropic activity linked to previous uranium (U) mining activities in the vicinity of the Rophin tailings storage site (Puy de Dôme, France). An interdisciplinary approach was developed based on a study of the site's history and records, as well as on a radiological and chemical characterization of soil cores and a dendrochronology. Gamma survey measurements of the wetland downstream of the Rophin site revealed a level of 1,050 nSv.h-1. Soil cores extracted in the wetland showed U concentrations of up to 1,855 mg.kg-1, which appears to be associated with the presence of a whitish silt loam (WSL) soil layer located below an organic topsoil layer. Records, corroborated by prior aerial photographs and analyses of 137Cs and 14C activities, suggest the discharge of U mineral particles while the site was being operated. Moreover, lead isotope ratios indicate that contamination in the WSL layer can be discriminated by a larger contribution of radiogenic
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https://hal.archives-ouvertes.fr/hal-03095931
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Submitted on : Wednesday, January 19, 2022 - 10:34:30 AM
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A. Martin, Y. Hassan-Loni, A. Fichtner, O. Péron, Karine David, et al.. An integrated approach combining soil profile, records and tree ring analysis to identify the origin of environmental contamination in a former uranium mine (Rophin, France). Science of the Total Environment, Elsevier, 2020, 747, pp.141295. ⟨10.1016/j.scitotenv.2020.141295⟩. ⟨hal-03095931⟩

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