The measurement of the isotopic composition of plutonium in an Irish Sea sediment by mass spectrometry |
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Authors: | P. J. Kershaw K. E. Sampson W. McCarthy R. D. Scott |
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Affiliation: | (1) Ministry of Agriculture, Fisheries and Food (MAFF), Directorate of Fisheries Research Lowestoft, NR33 OHT Suffolk, (UK);(2) Scottish Universities Research and Reactor Centre (SURRC), East Kilbride, G75 0QK Glasgow, (UK);(3) Atomic Weapons Establishment (AWE), Aldermaston, RGT 4PR Reading, Berkshire, (UK) |
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Abstract: | Samples from sediment cores, collected from a site close to the Sellafield outfall and dated using conventional - and -spectrometry, have been analysed using Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and Thermal Ionisation Mass Spectrometry (TIMS). This has provided information on the isotopic composition of plutonium in the liquid discharges from Sellafield; such information is not available using conventional -spectrometry alone. There was very good agreement between the240Pu/239Pu ratios obtained by the two MS methods. More recent discharges have been characterised by a progressive decrease in the relative proportion of239Pu. |
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