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キーワード:
Vertical-distribution
Variability
Sapporo
Pb-210
Cs-137
Japan
Site
Gas
Inorganic & Nuclear
要旨:
Environmental radionuclides (K-40, Cs-137, Pb-210, Ra-226) 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 Cs-137 was only found in the uppermost portion of the soils in small amount, whereas the Pb-210 activity was exceptionally high at the soil surfaces in a tropical stand of Alto Mayo. The results suggest a fallout nuclide, Pb-210, having been transported from local source(s) not to be specified yet. [References: 18]
