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Natural radioactivity and radon concentration were studied in drinking water samples from Baling area, Kedah, Malaysia, using HPGe and RAD-7 detectors, respectively. Average concentrations obtained for 226 Ra, 232 Th, 40 K and 222 Rn were 44.2 ± 3.9, 38.1 ± 5.0, 140.9 ± 10.6 mBq l −1 and 5.7 ± 0.68 Bq l −1 , respectively. Cumulative annual effective doses due to ingestion of 226 Ra, 232 Th, 40 K and 222 Rn for infants, children and adults were estimated to be 13.77, 2.857 and 2.581 μSv y −1 , respectively. Average annual effective doses due to inhalation of radon released in the air during consumption and ingestion of drinking water were separately estimated to be 15.2 and 1.2 μSv y −1 , respectively. A positive correlation ( R 2 = 0.87) was observed between 222 Rn and 226 Ra determined by RAD-7 and HPGe detectors, respectively. In this study, the estimated annual effective doses due to ingestion of 226 Ra, 232 Th, 40 K and 222 Rn for infants, children and adults were found to be below the World Health Organization (WHO) recommended limits of 0.1 mSv y −1 .

Age-dependent annual effective dose estimations of 226Ra, 232Th, 40K and 222Rn from drinking water in Baling, Malaysia