Indoor radon concentrations in Adana, Turkey

The indoor radon concentration in Adana, Turkey was measured in living rooms of 52 houses during winter 2005 and 57 houses during summer 2005. Forty-four houses were selected for both winter and summer researches for estimating seasonal variations. Indoor radon concentrations were measured seasonally over hotter and colder 2 months over the whole year, using CR-39 passive nuclear track radon detectors. The radon concentrations were ranged from 15 to 97 Bq m−3 on January–February 2005 for 60 d and from 5 to 70 Bq m−3 on June–July 2005 for 60 d. The average summer concentration measured was 25.8 Bq m−3 and the average winter concentration was 48.9 Bq m−3 in 44 houses that observed seasonal variations. The differences between winter and summer periods were ranged from 1 to 77 Bq m−3. The average value in both winter and summer periods is 37 Bq m−3 in 44 houses that observed seasonal variations. This value is below the worldwide indoor radon concentration distribution of 46 Bq m−3. The annual effective dose equivalent from 222Rn was 0.9 mSv y−1.