Abstract
In this study, the distribution of natural radionuclides in surface soils in Ardahan province has been determined. The activity concentrations of 238 U, 232 Th, 40 K and 137 Cs in 35 soil samples collected from the Ardahan city and its surrounded districts were measured through NaI (Tl) gamma spectrometry. The average activities of the samples were determined to be 29.9±6.2, 36.7±6.8 and 435.1±23.9 Bq kg -1 for the natural radionuclides 238 U, 232 Th and 40 K, respectively. For the fission product 137 Cs, the average activity of the samples was assigned to be 15.5±0.8 Bq kg -1 . The average outdoor gamma dose rate (terrestrial and cosmic) and also the average annual effective dose rate in air due to the presence of radionuclides in 35 soil samples were obtained as 56.3±8.7 nGy h -1 and 69.0±6.7 µSv y -1 , respectively. This research showed a clear correlation between the altitude and the natural radionuclides. The results obtained for Ardahan city centrum and its districts were presented graphically and compared with the world average values and those of Turkey.
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