Controls on anthropogenic radionuclide distribution in the Sellafield-impacted Eastern Irish Sea

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dc.contributor.author Ray, Daisy
dc.contributor.author Leary, Peter
dc.contributor.author Livens, Francis
dc.contributor.author Gray, Neil
dc.contributor.author Morris, Katherine
dc.contributor.author Law, Kathleen A.
dc.contributor.author Fuller, Adam J.
dc.contributor.author Abrahamsen-Mills, Liam
dc.contributor.author Howe, John
dc.contributor.author Tierney, Kieran
dc.contributor.author Muir, Graham
dc.contributor.author Law, Gareth T.W.
dc.date.accessioned 2020-08-18T10:00:01Z
dc.date.available 2020-08-18T10:00:01Z
dc.date.issued 2020-11-15
dc.identifier.citation Ray , D , Leary , P , Livens , F , Gray , N , Morris , K , Law , K A , Fuller , A J , Abrahamsen-Mills , L , Howe , J , Tierney , K , Muir , G & Law , G T W 2020 , ' Controls on anthropogenic radionuclide distribution in the Sellafield-impacted Eastern Irish Sea ' , The Science of the Total Environment , vol. 743 , 140765 . https://doi.org/10.1016/j.scitotenv.2020.140765
dc.identifier.other PURE: 140428642
dc.identifier.other PURE UUID: 3b0ae3b5-993c-4e3d-ac45-b910ad443823
dc.identifier.other Bibtex: RAY2020140765
dc.identifier.other ORCID: /0000-0002-2320-6330/work/79183392
dc.identifier.other WOS: 000573545300007
dc.identifier.uri http://hdl.handle.net/10138/318385
dc.description.abstract Understanding anthropogenic radionuclide biogeochemistry and mobility in natural systems is key to improving the management of radioactively contaminated environments and radioactive wastes. Here, we describe the contemporary depth distribution and phase partitioning of 137Cs, Pu, and 241Am in two sediment cores taken from the Irish Sea (Site 1: the Irish Sea Mudpatch; Site 2: the Esk Estuary). Both sites are located ~10 km from the Sellafield nuclear site. Low-level aqueous radioactive waste has been discharged from the Sellafield site into the Irish Sea for >50 y. We compare the depth distribution of the radionuclides at each site to trends in sediment and porewater redox chemistry, using trace element abundance, microbial ecology, and sequential extractions, to better understand the relative importance of sediment biogeochemistry vs. physical controls on radionuclide distribution/post-depositional mobility in the sediments. We highlight that the distribution of 137Cs, Pu, and 241Am at both sites is largely controlled by physical mixing of the sediments, physical transport processes, and sediment accumulation. Interestingly, at the Esk Estuary, microbially-mediated redox processes (considered for Pu) do not appear to offer significant controls on Pu distribution, even over decadal timescales. We also highlight that the Irish Sea Mudpatch likely still acts as a source of historical pollution to other areas in the Irish Sea, despite ever decreasing levels of waste output from the Sellafield site. en
dc.format.extent 14
dc.language.iso eng
dc.relation.ispartof The Science of the Total Environment
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject ADSORPTION
dc.subject ARTIFICIAL RADIONUCLIDES
dc.subject Americium
dc.subject Cesium
dc.subject ESTUARINE SEDIMENTS
dc.subject Esk Estuary
dc.subject INTER-TIDAL SEDIMENTS
dc.subject Irish Sea
dc.subject PLUTONIUM
dc.subject Plutonium
dc.subject SALT-MARSH
dc.subject SHEWANELLA-ONEIDENSIS
dc.subject SP NOV.
dc.subject SURFACE SEDIMENTS
dc.subject Sellafield Ltd.
dc.subject WASTE RADIONUCLIDES
dc.subject 116 Chemical sciences
dc.title Controls on anthropogenic radionuclide distribution in the Sellafield-impacted Eastern Irish Sea en
dc.type Article
dc.contributor.organization Department of Chemistry
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1016/j.scitotenv.2020.140765
dc.relation.issn 0048-9697
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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