Soil-to-Plant Transfers Factor of Natural Radionuclides in Groundnut Crops Grown on Soils with Different Levels of Background Radioactivity
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The plant/soil transfer factors (TFs) of uranium (238U), thorium (232Th) and potassium (40K) were measured in groundnut (Arachis hypogaea) at five different natural background soils. The TFs (on a dry weight basis) were in the range of 0.003–0.473, 0.003–0.548 and 0.430–1.479 for 238U, 232Th and 40K, respectively. The concentrations of 238U in groundnuts were in the order: roots > pods > seeds > leaves, while for 232Th the order was roots > pods > seeds > leaves and for 40K the order was roots > seeds > pods > leaves. The uptake of 40K in groundnuts showed an inverse relationship with the uptake of 238U. We observed that among three natural radionuclides, the 40K transfer factor values are higher than those of 238U and 232Th in all cases.
KeywordsNatural radionuclide Groundnut Transfer factor Uranium Thorium Potassium
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