Natural and artificial radionuclides in a marine core. First results of 236U in North Atlantic Ocean sediments
There are very few data available of 236U in marine sediment cores. In this study we present the results from the first oceanic depth profile of 236U in a sediment core sampled in the North Atlantic Ocean, at the PAP site (4500 m depth, Porcupine Abyssal Plain (PAP) site, 49°0′ N, 16°30′ W). Additio...
Published in: | Journal of Environmental Radioactivity |
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Online Access: | http://hdl.handle.net/10261/194953 https://doi.org/10.1016/j.jenvrad.2017.10.001 https://doi.org/10.13039/501100003329 |
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ftcsic:oai:digital.csic.es:10261/194953 2024-02-11T10:06:09+01:00 Natural and artificial radionuclides in a marine core. First results of 236U in North Atlantic Ocean sediments Villa-Alfageme, María Chamizo, Elena Santos, F. J. López-Gutiérrez, J. M. Gómez-Martínez, Isabel Hurtado-Bermúdez, Santiago Ministerio de Economía y Competitividad (España) Villa-Alfageme, María Chamizo, Elena Santos, F. J. López-Gutiérrez, J. M. Hurtado-Bermúdez, Santiago 2018-06 http://hdl.handle.net/10261/194953 https://doi.org/10.1016/j.jenvrad.2017.10.001 https://doi.org/10.13039/501100003329 en eng Elsevier #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/FIS2015-69673-P http://dx.doi.org/10.1016/j.jenvrad.2017.10.001 Sí Journal of Environmental Radioactivity 186: 152-160 (2018) 0265-931X http://hdl.handle.net/10261/194953 doi:10.1016/j.jenvrad.2017.10.001 http://dx.doi.org/10.13039/501100003329 none Sediment cores Nuclear fuel reprocessing plants Inventory artículo http://purl.org/coar/resource_type/c_6501 2018 ftcsic https://doi.org/10.1016/j.jenvrad.2017.10.00110.13039/501100003329 2024-01-16T10:45:40Z There are very few data available of 236U in marine sediment cores. In this study we present the results from the first oceanic depth profile of 236U in a sediment core sampled in the North Atlantic Ocean, at the PAP site (4500 m depth, Porcupine Abyssal Plain (PAP) site, 49°0′ N, 16°30′ W). Additionally, the sediment core was radiologically characterized through the measurement of anthropogenic 137Cs, 239Pu, 240Pu, 129I and 14C and natural 210Pb, 40K and 226Ra. The measured 236U concentrations decrease from about 90·106 at g−1 at the seafloor down to 0.5·106 at g−1 at 6 cm depth. They are several orders of magnitude lower than the reported values for soils from the Northern Hemisphere solely influenced by global fallout (i.e. from 2700·106 to 7500·106 at g−1). 236U/238U atom ratios measured are at least three orders of magnitude above the estimated level for the naturally occurring dissolved uranium. The obtained inventories are 1·1012 at m−2 for 236U, 80 Bq m−2 for 137Cs, 45 Bq m−2 for 239+240Pu and 2.6·1012 at m−2 for 129I. Atomic ratios for 236U/239Pu, 137Cs/236U and 129I/236U, obtained from the inventories are 0.036, 0.11 and 2.5 respectively. Concentration profiles show mobilization probably due to bioturbation from the abundant detritivore holothurian species living at the PAP site sea-floor. The range of 236U, 137Cs, 239+240Pu and 129I values, inventories and ratios of these anthropogenic radionuclides are more similar to the values due to fall-out than values from a contribution from the Nuclear Fuel Reprocessing Plants dispersed to the south-west of the North Atlantic Ocean. However, signs of an additional source are detected and might be associated to the nuclear wastes dumped on the Eastern North Atlantic Ocean. This work was partly supported by Spanish MINECO research project No. FIS2015-69673-P. Peer reviewed Article in Journal/Newspaper North Atlantic Digital.CSIC (Spanish National Research Council) Journal of Environmental Radioactivity 186 152 160 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Sediment cores Nuclear fuel reprocessing plants Inventory |
spellingShingle |
Sediment cores Nuclear fuel reprocessing plants Inventory Villa-Alfageme, María Chamizo, Elena Santos, F. J. López-Gutiérrez, J. M. Gómez-Martínez, Isabel Hurtado-Bermúdez, Santiago Natural and artificial radionuclides in a marine core. First results of 236U in North Atlantic Ocean sediments |
topic_facet |
Sediment cores Nuclear fuel reprocessing plants Inventory |
description |
There are very few data available of 236U in marine sediment cores. In this study we present the results from the first oceanic depth profile of 236U in a sediment core sampled in the North Atlantic Ocean, at the PAP site (4500 m depth, Porcupine Abyssal Plain (PAP) site, 49°0′ N, 16°30′ W). Additionally, the sediment core was radiologically characterized through the measurement of anthropogenic 137Cs, 239Pu, 240Pu, 129I and 14C and natural 210Pb, 40K and 226Ra. The measured 236U concentrations decrease from about 90·106 at g−1 at the seafloor down to 0.5·106 at g−1 at 6 cm depth. They are several orders of magnitude lower than the reported values for soils from the Northern Hemisphere solely influenced by global fallout (i.e. from 2700·106 to 7500·106 at g−1). 236U/238U atom ratios measured are at least three orders of magnitude above the estimated level for the naturally occurring dissolved uranium. The obtained inventories are 1·1012 at m−2 for 236U, 80 Bq m−2 for 137Cs, 45 Bq m−2 for 239+240Pu and 2.6·1012 at m−2 for 129I. Atomic ratios for 236U/239Pu, 137Cs/236U and 129I/236U, obtained from the inventories are 0.036, 0.11 and 2.5 respectively. Concentration profiles show mobilization probably due to bioturbation from the abundant detritivore holothurian species living at the PAP site sea-floor. The range of 236U, 137Cs, 239+240Pu and 129I values, inventories and ratios of these anthropogenic radionuclides are more similar to the values due to fall-out than values from a contribution from the Nuclear Fuel Reprocessing Plants dispersed to the south-west of the North Atlantic Ocean. However, signs of an additional source are detected and might be associated to the nuclear wastes dumped on the Eastern North Atlantic Ocean. This work was partly supported by Spanish MINECO research project No. FIS2015-69673-P. Peer reviewed |
author2 |
Ministerio de Economía y Competitividad (España) Villa-Alfageme, María Chamizo, Elena Santos, F. J. López-Gutiérrez, J. M. Hurtado-Bermúdez, Santiago |
format |
Article in Journal/Newspaper |
author |
Villa-Alfageme, María Chamizo, Elena Santos, F. J. López-Gutiérrez, J. M. Gómez-Martínez, Isabel Hurtado-Bermúdez, Santiago |
author_facet |
Villa-Alfageme, María Chamizo, Elena Santos, F. J. López-Gutiérrez, J. M. Gómez-Martínez, Isabel Hurtado-Bermúdez, Santiago |
author_sort |
Villa-Alfageme, María |
title |
Natural and artificial radionuclides in a marine core. First results of 236U in North Atlantic Ocean sediments |
title_short |
Natural and artificial radionuclides in a marine core. First results of 236U in North Atlantic Ocean sediments |
title_full |
Natural and artificial radionuclides in a marine core. First results of 236U in North Atlantic Ocean sediments |
title_fullStr |
Natural and artificial radionuclides in a marine core. First results of 236U in North Atlantic Ocean sediments |
title_full_unstemmed |
Natural and artificial radionuclides in a marine core. First results of 236U in North Atlantic Ocean sediments |
title_sort |
natural and artificial radionuclides in a marine core. first results of 236u in north atlantic ocean sediments |
publisher |
Elsevier |
publishDate |
2018 |
url |
http://hdl.handle.net/10261/194953 https://doi.org/10.1016/j.jenvrad.2017.10.001 https://doi.org/10.13039/501100003329 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
#PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/FIS2015-69673-P http://dx.doi.org/10.1016/j.jenvrad.2017.10.001 Sí Journal of Environmental Radioactivity 186: 152-160 (2018) 0265-931X http://hdl.handle.net/10261/194953 doi:10.1016/j.jenvrad.2017.10.001 http://dx.doi.org/10.13039/501100003329 |
op_rights |
none |
op_doi |
https://doi.org/10.1016/j.jenvrad.2017.10.00110.13039/501100003329 |
container_title |
Journal of Environmental Radioactivity |
container_volume |
186 |
container_start_page |
152 |
op_container_end_page |
160 |
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1790603684225220608 |