Abstract. The activity concentrations of 40 K, 226 Ra and 232 Th from 50 locations on the territory of Subotica, North Serbia, were determined by gamma ray spectrometry. Based on the activity concentrations of investigated radionuclides, the absorbed gamma dose rate in the air was calculated. The mean values of activity concentrations were found to be 290 Bq/kg for 40 K, 20 Bq/kg for 226 Ra and 18 Bq/kg for 232 Th. The total absorbed gamma dose rate varied between 24 and 46 nGy/h. The mean value of 32 nGy/h was lower than the world average value.
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