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  • 1 Graduate School of Engineering, Hokkaido University, Sapporo, 060-8628 Japan
  • | 2 Max Plank Institute for Biogeochemistry, Jena, Germany
  • | 3 Institute of Botany and Botanical Gardens, University of Hohenheim, Stuttgart, Germany
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Environmental radionuclides (40K, 137Cs, 210Pb, 226Ra) were determined in soils under semi-arid stands, a transition area from thorn to deciduous forest in El Angolo, and heath stands in the Alto Mayo in Northern Peru in order to elucidate their activity level in soil, and to trace underground environment in remote areas of little anthropogenic intervention. Anthropogenic 137Cs was only found in the uppermost portion of the soils in small amount, whereas the 210Pb activity was exceptionally high at the soil surfaces in a tropical stand of Alto Mayo. The results suggest a fallout nuclide, 210Pb, having been transported from local source(s) not to be specified yet.