Abstract

²²²Rn is a radioactive, odorless, and colorless element which has a half-life of 3.83 days. One of ²²²Rn main resources are Groundwater (wells, springs, etc.). Hence, the use of groundwater with high concentration of ²²²Rn can increase the risk of lung and stomach cancers. Concentration of ²²²Rn in tap water of Minab city in two temperatures 5 and 15 ºC was measured by radon meter model RTM1668-2. The effective dose was calculated by equations proposed by UNSCEAR. Geometric mean concentration of ²²²Rn in drinking water was found to be 0.78±0.06 and 0.46±0.04 Bq/l at 5 and 15  ̊C (p value<0.05), respectively. The effective doses were 0.006 and 0.003 mSv/y for adults, and 0.011 and 0.007 mSv/y for the children, respectively (p value<0.05). Besides, the effective dose for adult through inhaling ²²²Rn at 5 and 15  ̊C were estimated 0.0021 and 0.0012mSv/y, respectively. Geometric mean concentration in ²²²Rn drinking water and effective dose received from drinking water and inhalation of ²²²Rn is lower than WHO and EPA standard limits. Increasing temperature of drinking water will decrease the effective dose received. Annual Effective dose received from inhalation and consumption of ²²²Rn in drinking water in children is more than adults.

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