Abstract
The 226Ra, 232Th, and 40K vertical profiles were studied in relation to the following soil properties: pHH2O, the sum of exchangeable Ca2+ and Mg2+, the saturation with bases, and the content of humus and mobile forms of phosphorus and potassium. An increase in the specific activity of 226Ra, 232Th, and 40K as a result of humus accumulation and the biogenic accumulation of mobile forms of potassium and phosphorus was detected in the 0- to 10-cm layer of the A horizon in the soil under an oak forest. The removal of 226Ra from the middle part of the profile of dark gray forest deep-carbonate soil was recorded. A positive correlation between the specific activity of 226Ra and the total exchangeable bases of Ca2+ and Mg2+ in the A, A(AE), AB, and deeper (B1, B2, and B3) horizons was revealed. This indicates the interrelated behavior of these elements-analogues. The removal of 232Th from the A(AE) horizon and its accumulation in the AB horizon under conditions of local podzolization of dark gray forest soil in a birch forest was observed.
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