This study presents the first measurements of anthropogenic plutonium (Pu and Pu) concentrations and atom ratios (Pu/Pu) for Tasmania, in sediment collected from Bathurst Harbour, in the Tasmanian Wilderness World Heritage Area, Australia. The weighted mean Pu/Pu 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 Pu/Pu atom ratios ranged between 0.11 and 0.21 with the earliest recorded Pu/Pu atom ratios being the lowest, suggesting an influence of low atom ratio fallout from nuclear testing in Australia. Post-moratorium fallout Pu/Pu atom ratios were consistent with other records. Lead-210 (Pb) sediment chronologies indicate sediment accumulation rates have increased since the early part of the 19th century at this location.
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| http://dx.doi.org/10.1016/j.jenvrad.2021.106679 | DOI Listing |
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