Abnormal amount of radon in water results in increasing health risks. Concentrations of 222 Rn in 56 samples of drinking water resources, in villages surrounding ''Rafsanjan fault'' were measured in the fall of 2013.Range radon concentration is 0 and 18.480 BqL -1 , respectively. The maximum annual effective dose for adults and children were 181.5 and 248.95 lSvY -1 , respectively, and the lowest was zero for both groups. Radon concentration is higher on the right side of the fault than the left side. In order to reduce the radon concentration, water ventilation is recommended before use.
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