Determination of radon activity concentrations in dwellings by alpha track detectors in Bergama Kozak granite area

The present study is aimed measurement of indoor radon activity concentrations of the Kozak-Bergama granit area and assessment from radiological risk perspective. In this context, LR-115 type Solid State Nuclear Track Detectors were installed in dwellings and they were kept for 1 month. The LR-115 detectors were etched for 120 minute in percentage10 (2,5 N) NaOH at 60 centigrade degree and were related to radon activity concentrations were estimated from the observed microskopic track densities. Measured indoor radon concentrations in the studied area ranged from 25 to 236 Bq in m3. Annual effective dose equivalent due to indoor radon was determined in the range of 0.64 - 5.96 mSv in year. Comparing the current indoor radon results with those of the ICRP and USEPA (i.e. 200 and 148 Bq m3) limits, majority of the houses surveyed in the present study are within the safe limits.