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Isolation of 236U and 239,240Pu from seawater samples and its determination by Accelerator Mass Spectrometry

AutorLópez-Lora, Mercedes; Chamizo, Elena ; Villa-Alfageme, María; Hurtado-Bermúdez, Santiago; Casacuberta, Nuria; García-León, Manuel
Palabras claveIon-exchange chromatography
Preconcentration
Accelerator Mass Spectrometry
Seawater
Plutonium
236U
Fecha de publicación2018
EditorElsevier
CitaciónTalanta 178: 202-210 (2018)
ResumenIn this work we present and evaluate a radiochemical procedure optimised for the analysis of U and Pu in seawater samples by Accelerator Mass Spectrometry (AMS). The method is based on Fe(OH) co-precipitation of actinides and uses TEVA® and UTEVA® extraction chromatography resins in a simplified way for the final U and Pu purification. In order to improve the performance of the method, the radiochemical yields are analysed in 1 to 10 L seawater volumes using alpha spectrometry (AS) and Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Robust 80% plutonium recoveries are obtained; however, it is found that Fe(III) concentration in the precipitation solution and sample volume are the two critical and correlated parameters influencing the initial uranium extraction through Fe(OH) co-precipitation. Therefore, we propose an expression that optimises the sample volume and Fe(III) amounts according to both the U and Pu concentrations in the samples and the performance parameters of the AMS facility. The method is validated for the current setup of the 1 MV AMS system (CNA, Sevilla, Spain), where He gas is used as a stripper, by analysing a set of intercomparison seawater samples, together with the Laboratory of Ion Beam Physics (ETH, Zürich, Switzerland).
URIhttp://hdl.handle.net/10261/158608
Identificadoresdoi: 10.1016/j.talanta.2017.09.026
issn: 0039-9140
e-issn: 1873-3573
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