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.

本研究首次对从澳大利亚塔斯马尼亚荒野世界遗产区巴瑟斯特港收集的沉积物中塔斯马尼亚的人为钚（²³⁹ Pu 和²⁴⁰ Pu）浓度和原子比（²⁴⁰ Pu/ ²³⁹ Pu）进行了测量。在该站点测量的加权平均²⁴⁰ Pu/ ²³⁹ Pu 原子比为 0.172 ± 0.007，这与澳大利亚大陆以及全球和南半球平均值的公布数据一致。在²⁴⁰ PU / ²³⁹莆原子比率0.11和0.21具有最早记录介于²⁴⁰ PU / ²³⁹Pu 原子比最低，表明受澳大利亚核试验的低原子比辐射影响。暂停后的沉降物²⁴⁰ Pu/ ²³⁹ Pu 原子比与其他记录一致。Lead-210 ( ²¹⁰ Pb) 沉积物年代学表明自 19 世纪早期以来，该位置的沉积物积累率有所增加。