Abstract
The goal of the present work is to determine the specific activity of terrestrial thorium, uranium and potassium in Uzhgorod city and to predict the values of specific activity over the whole area of Uzhgorod city. The following values for the average specific activity in 2006–2012 were found for different radioisotopes from the surface soils (in Bq kg−1): 40K = 304.0 ± 12.3; 232Th = 24.2 ± 2.1; 238U = 19.2 ± 1.2. The average value of the absorbed dose was equal to 36.3 ± 2.3 nGy h−1. The average value of the external hazard index was equal to 0.22. The average annual effective dose of natural radionuclides was equal to 4.5 ± 0.3 10−5 Sv.
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