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Coffinite formation from UO(2+x)
Most of the highly radioactive spent nuclear fuel (SNF) around the world is destined for final disposal in deep-mined geological repositories. At the end of the fuel’s useful life in a reactor, about 96% of the SNF is still UO(2). Thus, the behaviour of UO(2) in SNF must be understood and evaluated...
Autores principales: | , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7376029/ https://www.ncbi.nlm.nih.gov/pubmed/32699386 http://dx.doi.org/10.1038/s41598-020-69161-1 |
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author | Szenknect, Stéphanie Alby, Delhia López García, Marta Wang, Chenxu Podor, Renaud Miserque, Frédéric Mesbah, Adel Duro, Lara Zetterström Evins, Lena Dacheux, Nicolas Bruno, Jordi Ewing, Rodney C. |
author_facet | Szenknect, Stéphanie Alby, Delhia López García, Marta Wang, Chenxu Podor, Renaud Miserque, Frédéric Mesbah, Adel Duro, Lara Zetterström Evins, Lena Dacheux, Nicolas Bruno, Jordi Ewing, Rodney C. |
author_sort | Szenknect, Stéphanie |
collection | PubMed |
description | Most of the highly radioactive spent nuclear fuel (SNF) around the world is destined for final disposal in deep-mined geological repositories. At the end of the fuel’s useful life in a reactor, about 96% of the SNF is still UO(2). Thus, the behaviour of UO(2) in SNF must be understood and evaluated under the weathering conditions of geologic disposal, which extend to periods of hundreds of thousands of years. There is ample evidence from nature that many uranium deposits have experienced conditions for which the formation of coffinite, USiO(4), has been favoured over uraninite, UO(2+x), during subsequent alteration events. Thus, coffinite is an important alteration product of the UO(2) in SNF. Here, we present the first evidence of the formation of coffinite on the surface of UO(2) at the time scale of laboratory experiments in a solution saturated with respect to amorphous silica at pH = 9, room temperature and under anoxic conditions. |
format | Online Article Text |
id | pubmed-7376029 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-73760292020-07-24 Coffinite formation from UO(2+x) Szenknect, Stéphanie Alby, Delhia López García, Marta Wang, Chenxu Podor, Renaud Miserque, Frédéric Mesbah, Adel Duro, Lara Zetterström Evins, Lena Dacheux, Nicolas Bruno, Jordi Ewing, Rodney C. Sci Rep Article Most of the highly radioactive spent nuclear fuel (SNF) around the world is destined for final disposal in deep-mined geological repositories. At the end of the fuel’s useful life in a reactor, about 96% of the SNF is still UO(2). Thus, the behaviour of UO(2) in SNF must be understood and evaluated under the weathering conditions of geologic disposal, which extend to periods of hundreds of thousands of years. There is ample evidence from nature that many uranium deposits have experienced conditions for which the formation of coffinite, USiO(4), has been favoured over uraninite, UO(2+x), during subsequent alteration events. Thus, coffinite is an important alteration product of the UO(2) in SNF. Here, we present the first evidence of the formation of coffinite on the surface of UO(2) at the time scale of laboratory experiments in a solution saturated with respect to amorphous silica at pH = 9, room temperature and under anoxic conditions. Nature Publishing Group UK 2020-07-22 /pmc/articles/PMC7376029/ /pubmed/32699386 http://dx.doi.org/10.1038/s41598-020-69161-1 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Szenknect, Stéphanie Alby, Delhia López García, Marta Wang, Chenxu Podor, Renaud Miserque, Frédéric Mesbah, Adel Duro, Lara Zetterström Evins, Lena Dacheux, Nicolas Bruno, Jordi Ewing, Rodney C. Coffinite formation from UO(2+x) |
title | Coffinite formation from UO(2+x) |
title_full | Coffinite formation from UO(2+x) |
title_fullStr | Coffinite formation from UO(2+x) |
title_full_unstemmed | Coffinite formation from UO(2+x) |
title_short | Coffinite formation from UO(2+x) |
title_sort | coffinite formation from uo(2+x) |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7376029/ https://www.ncbi.nlm.nih.gov/pubmed/32699386 http://dx.doi.org/10.1038/s41598-020-69161-1 |
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