Distribution of Chernobyl-derived 137 Cs, 90 Sr, 239 + 240 Pu, 241 Am, and 244 Cm among organic fractions of soddy-podzolic, sandy, soddy-meadow, and peat soils collected from the Chernobyl Exclusion Zone along the North-Western radioactive fallout track was determined. Regardless of the soil type, 80 385% of 137 Cs is tightly fixed on the mineral fraction of the soil. Depending on the soil type, 50 370% of 90 Sr and 153 45% of 241 Am are associated with fulvic acid fractions. 241 Am and 244 Cu are similarly distributed among the organic acid fractions. In all the soil types studied, 239 + 240 Pu is associated essentially with humic acid fractions. Natural 230, 232 Th and technogenic 239 + 240 Pu are similarly distributed among the organic fractions.
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