کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11026424 | 1666384 | 2018 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
An evidence of chemically and physically mediated migration of 238U and its daughter isotopes in the vicinity of a former uranium mine
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی هسته ای و مهندسی
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چکیده انگلیسی
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 1500â¯nSv.hâ1 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Radioactivity - Volume 195, December 2018, Pages 67-71
Journal: Journal of Environmental Radioactivity - Volume 195, December 2018, Pages 67-71
نویسندگان
Arnaud Mangeret, Pascale Blanchart, Gilles Alcalde, Xavier Amet, Charlotte Cazala, Marie-Odile Gallerand,