In this study, gamma activity concentrations of 238U, 232Th and 40K in surface soil and 222Rn concentrations in dwellings of Zonguldak were measured. In order to measure gamma activity a gamma spectrometry (ORTEC-905-4) with a high-sensitivity NaI (Tl) detector was used. Radon concentration measurements were made by the CR-39 nuclear track detectors. The measured activity concentrations of 238U, 232Th and 40K were found to be between 10-145, 23-91 and 215-755 Bqkg-1 with the averages of 40.7, 38.7 and 470.0 Bqkg-1, respectively. Radon concentrations were found to be from 27 to 234.5 Bq m-3 with the average of 68.6 Bq m-3.
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