© 2018 Elsevier Ltd 236U,239Pu and240Pu are present in soils mainly as a result of the local- and global-fallout from the atmospheric nuclear weapons tests carried out mainly in the 1950's and 1960's. In this work we provide new data on the presence of236U and239,240Pu in surface soils (i.e. up to 5 cm depth) from Chile and Africa. The results were obtained by low-energy Accelerator Mass Spectrometry (AMS). In the case of the Chilean samples,236U/239Pu atom ratios show a high variability and are in general higher than the reported value for the global fallout in the Northern Hemisphere, ranging from 0.2 to 1.5. The236U atomic concentrations range from 3.5 × 106to 9.1 × 106atoms/g, and are at least two orders of magnitude lower than the reported values in the Northern Hemisphere. The measured240Pu/239Pu atom ratio in soils from South-Africa and Mozambique are of about 0.17, in agreement with the expected one for global-fallout at those coordinates. To best knowledge of the authors the present work is the first publication on236U concentrations and236U/239Pu atom ratios in soils from South-America and Africa.
Salmani-Ghabeshi, S., Chamizo, E., Christl, M., Miró, C., Pinilla-Gil, E., & Cereceda-Balic, F. (2018). Presence of236U and239,240Pu in soils from Southern Hemisphere. Journal of Environmental Radioactivity, 478-484. https://doi.org/10.1016/j.jenvrad.2018.08.003