オクダ　ケイ   OKUDA Kei   奥田　圭    所属   広島修道大学  人間環境学部    職種   准教授
言語種別	英語
発行・発表の年月	2021/02
形態種別	学術論文
査読	査読有り
標題	Differentiating Fukushima and Nagasaki plutonium from global fallout using 241Pu/239Pu atom ratios: Pu vs. Cs uptake and dose to biota
執筆形態	共著
掲載誌名	Science of the Total Environment
掲載区分	国外
巻・号・頁	754,pp.#141890
頁数	11
著者・共著者	Johansen, MP., Anderson, D., Child, D., Hotchkis MAC., Tsukada, H.,Okuda, K.and Hinton, TG.
概要	This paper compares the environmental plutonium that originated from the Fukushima Daiichi NPP accident, the 1945 detonation at Nagasaki and the global fallout that persists in Japan soils. The Nagasaki event contributed more Pu to the local environment than at FDNPP where the accident added scant new Pu of ~0.4%–2% in soils, ~0.3%–3% in earthworms, and ~1%–10% in wild boar. These low levels of Pu were difficult to measure even using the most highly sensitive accelerator mass spectrometry methods. Our study relied mainly on 241Pu/239Pu atom ratios as the typically-used Pu measures of 'activity concentrations' and the 240Pu/239Pu atom ratios did not resolve the FDNPP Pu from background in most samples collected five years after the event.