Plutonium (Pu) has been released in Japan by two very different types of nuclear events – the 2011 Fukushima accident and the 1945 detonation of a Pu-core weapon at Nagasaki. This paper presents the use of Accelerator Mass Spectrometry (AMS) methods to distinguish the FDNPP-accident and Nagasaki-detonation Pu from worldwide fallout in soils and biota.
Johansen, M.P., Anderson, D., Child, D., Hotchkis, M.A.C., Tsukada H., Okuda, K., and T.G. Hinton. Differentiating Fukushima and Nagasaki plutonium from global fallout using 241Pu/239Pu atom ratios: Pu vs. Cs uptake and dose to biota. Science of the Total Environment 754 (2021) 141890.