An EXAFS study on Sr and Cs speciation in clayey soils at nuclear legacy sites

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dc.contributor.authorBots, Pen_AU
dc.contributor.authorLunn, RJen_AU
dc.contributor.authorComarmond, MJen_AU
dc.contributor.authorPayne, TEen_AU
dc.contributor.authorRenshaw, JCen_AU
dc.date.accessioned2024-02-29T23:59:54Zen_AU
dc.date.available2024-02-29T23:59:54Zen_AU
dc.date.issued2020-06-21en_AU
dc.date.statistics2024-03-01en_AU
dc.description.abstractThrough more than 60 years of nuclear power generation, and a longer history of nuclear research, many legacy waste sites with stored radioactive wastes exist throughout the world. Such legacy sites include Savannah River (NC, USA), Sellafield (Cumbria, UK) and the Little Forest Legacy Site (NSW, Australia). The location of such sites was often chosen based on the local geology and soil composition. For example, the Little Forest Legacy Site was chosen based on the clayey nature of the soils and rocks present (~50 % kaolinite and illite-smectite), limiting water movement and migration of radioactive contaminants. However, despite the clay-rich environment, radioactive contaminants (including fission products and actinides) have been detected in sediments, groundwater, surface runoff and vegetation at the Little Forest Legacy Site.4,5 In order to ensure continued safe management of the site, as well as to develop new engineering stategies for radwaste containment and / or cleanup, an improved understanding of the geochemistry of radioactive contaminants is required. For this presentation we focused on the geochemical speciation of Sr and Cs in contact with clay minerals and a composite clayey soil. We performed a comprehensive set of adsorption experiments and XAS analyses. Subsequently, in order to obtain detailed information we utilized two EXAFS fitting strategies. The first, a semi-shell-by-shell strategy of the EXAFS, was used to determine the Sr and Cs surface complexes on the clay minerals. The second (based on the identified surface complexes) provided details on the complexation / distribution of Sr and Cs within a clayey soil.en_AU
dc.identifier.articlenumber229en_AU
dc.identifier.citationBots, P., Lunn, R., Comarmond, J, Payne, T., & Renshaw, J (2020). An EXAFS study on Sr and Cs speciation in clayey soils at nuclear legacy sites. Presented to Goldschmidt Virtual 2020, 21-26 June 2020.en_AU
dc.identifier.conferenceenddate2020-06-26en_AU
dc.identifier.conferencenameGoldschmidt Virtual 2020en_AU
dc.identifier.conferenceplaceVirtualen_AU
dc.identifier.conferencestartdate2020-06-21en_AU
dc.identifier.urihttp://dx.doi.org/10.46427/gold2020.229en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15511en_AU
dc.publisherGeochemical Societyen_AU
dc.subjectNuclear industryen_AU
dc.subjectNuclear poweren_AU
dc.subjectRadioactive wastesen_AU
dc.subjectGround wateren_AU
dc.subjectContaminationen_AU
dc.subjectSoilsen_AU
dc.subjectActinidesen_AU
dc.subjectClaysen_AU
dc.subjectDecontaminationen_AU
dc.titleAn EXAFS study on Sr and Cs speciation in clayey soils at nuclear legacy sitesen_AU
dc.typeConference Abstracten_AU
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