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

作者：Ahmad Nisar^*; ur Rehman Jalil; Rafique Muhammad; Nasir Tabassum

来源：Water Science and Technology: Water Supply , 2018, 18(1): 32-39.

DOI：10.2166/ws.2017.094

• effective doses
• HPGe
• RAD-7
• radionuclides
• radon
• water

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 Ra-226, Th-232, K-40 and Rn-222 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 Ra-226, Th-232, K-40 and Rn-222 for infants, children and adults were estimated to be 13.77, 2.857 and 2.581 mu Sv 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 mu Sv y(-1), respectively. A positive correlation (R-2 = 0.87) was observed between Rn-222 and Ra-226 determined by RAD-7 and HPGe detectors, respectively. In this study, the estimated annual effective doses due to ingestion of Ra-226, Th-232, K-40 and Rn-222 for infants, children and adults were found to be below the World Health Organization (WHO) recommended limits of 0.1 mSv y(-1).

• 出版日期2018-2