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- W2895575310 abstract "The present study reports the evidence of a radioactive contamination in a wetland located downstream from a former French U mine in Brittany. This situation is demonstrated according to the measurements of gamma dose rates and activity ratios of 238U and 232Th-decay series nuclides, which give the justification regarding the accumulation of significant amounts of 238U, 230Th and 226Ra in this wetland. The dose rate map highlights an increase of radiation level along the former mine water pathway compared to the background value, with a maximum value of 1500 nSv.h-1 reached in the wetland. Activities of 238U, 230Th and 226Ra and 232Th/238U ratios measured in surface wetland soils are significantly higher than the geochemical background. 230Th/238U ratios less than unity suggest a preferential accumulation of U in the wetland, compared to its daughter isotopes. Moreover, the loss of 226Ra compared to 230Th raises its higher mobility compared to its parent isotope. In far-field sediments, 226Ra/238U ratio of 1.76 implies a different geochemical behavior of U, which could be explained by the occurrence of mobile U species. The results suggest that contamination of wetland soils and far-field sediments could result from discharges of underground mine waters." @default.
- W2895575310 created "2018-10-12" @default.
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- W2895575310 date "2018-12-01" @default.
- W2895575310 modified "2023-09-30" @default.
- W2895575310 title "An evidence of chemically and physically mediated migration of 238U and its daughter isotopes in the vicinity of a former uranium mine" @default.
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- W2895575310 doi "https://doi.org/10.1016/j.jenvrad.2018.08.018" @default.
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