J.M. Kelley

TL;DR: From the results, it is concluded that fallout 237Np/239Pu atom ratios are generally lower in the Southern Hemisphere than in the Northern Hemisphere, and 237NP/ 239Puatom ratios are more device-dependent, hence more variable, than counterpart 240Pu/239Np atom ratios.

TL;DR: This work is unique in its application of a novel combination of sampling and processing protocols as well as its use of thermal ionization mass spectrometry for the detection of Pu isotopes, which allows quantification of the Pu source terms and better determination of the ambient Pu size and redox speciation representative of in situ conditions.

TL;DR: In this article, thermal ionization mass spectrometry measurements of 239 Pu, 240 Pu, 241 Pu, 242 Pu, and 237 Np isolated from oceanic, estuarine, and riverine sediments from the Arctic Ocean Basin were performed.

TL;DR: In this paper, mass spectrometry measurements of Pu, U and Np isolated from soils contaminated by the 1957 accident at the Mayak nuclear complex in the Southern Ural mountains (Kyshtym accident) and from soils collected at and near the Former Soviet Union (FSU) test site at Semipalatinsk-21 are reported.

TL;DR: In this paper, the authors measured the 237 Np 239 Pu atom ratios in a variety of soils throughout the northern hemisphere, including repetitive analyses of the soils used to establish the ratio cited above.