RADON CONCENTRATION IN GROUND WATER OF DHAKA CITY, BANGLADESH

Water is the most important source of life and ground water may contain varying levels of radioactivity. So it is therefore important to measure radon concentration in ground water for public health and radiation protection. In this study, radon concentration was measured in ground water samples collected from water pumps of different locations at Dhaka city, Bangladesh. Twenty ground water samples were collected in July 2017to April 2018 for radon level measurement. Radon detector RAD7 (manufactured by Durridge Company, USA) with RAD H2O technique was used for the measurement. The highest radon concentration was found 13.00±0.70 Bq/L for the pump of sample ID GW1 and the lowest radon concentration 2.13±0.593 Bq/L for the pump of sample ID GW10.The activity concentration of radon in maximum water samples in Dhaka city was lower than the value 11.1 Bq/L recommended by United States Environmental Protection Agency (USEPA). The radon concentration was lowered from the activity concentration before storage. The highest value of annual effective dose for radon in ground water was found 0.04745 mSv/y According to recommendation of World Health Organization, the annual effective dose level for radon in drinking water is 0.1 mSv/y. These results indicate that there is no probability of health hazards for public due to presences of radon in ground water and it is safe for consumption.