Tims, Stephen G.Fifield, L. KeithHancock, Gary J.Lal, Rajeev R.Hoo, Wee T.2025-12-172025-12-170168-583XORCID:/0000-0001-6014-0126/work/162208248https://hdl.handle.net/1885/733795992The 240Pu/239Pu ratio of the global plutonium fallout from atmospheric nuclear weapons testing is typically in the range 0.17-0.19. However, the influence of regional nuclear installations or nearby weapons test sites can lead to local values outside this range. We report 240Pu/239Pu ratios at 14 representative sites across the Australian continent, and find that the weapons tests carried out in Australia appear to have made a significant contribution to the total fallout in the center of the continent, despite their relatively small explosive yield.6enAMSFalloutIsotope ratiosPlutonium201310.1016/j.nimb.2012.07.01084870940797