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    This study presents the first measurements of anthropogenic plutonium (239Pu and 240Pu) concentrations and atom ratios (240Pu/239Pu) for Tasmania, in sediment collected from Bathurst Harbour, in the Tasmanian Wilderness World Heritage Area, Australia. The weighted mean 240Pu/239Pu atom ratio measured at this site was 0.172 ± 0.007 which is consistent with published data from mainland Australia and global and Southern Hemisphere averages. The 240Pu/239Pu atom ratios ranged between 0.11 and 0.21 with the earliest recorded 240Pu/239Pu atom ratios being the lowest, suggesting an influence of low atom ratio fallout from nuclear testing in Australia. Post-moratorium fallout 240Pu/239Pu atom ratios were consistent with other records. Lead-210 (210Pb) sediment chronologies indicate sediment accumulation rates have increased since the early part of the 19th century at this location. Crown Copyright © 2021. Published by Elsevier Ltd. All rights reserved.


    Jennifer J Harrison, Krystyna M Saunders, David P Child, Michael A C Hotchkis. A record of fallout 239Pu and 240Pu at World Heritage Bathurst Harbour, Tasmania, Australia. Journal of environmental radioactivity. 2021 Oct;237:106679

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    PMID: 34118615

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