Abstract
This study aims to measure the radon (222Rn) concentrations in the three types of water (groundwater, surface water, and health drinking water) in Al Haidariya city at Al-Najaf governorate, Iraq using RAD-7 detectors. The results show that the average of 222Rn in groundwater, surface water, and health drinking water were (0.276 Bq/L, 0.182 Bq/L and 0.132 Bq/L3) respectively, whereas the average of annual effective dose was (0.706 μSv/y,0.46 μSv/y and 0.337 μSv/y), respectively, While lifetime cancer risk (×10-4) with an average (0.027, 0.018 and 0.013) respectively. According to the results of 222Rn, the samples can be arranged in order groundwater, surface water and health drinking water. The results of the radon concentrations and the rate of annual effective dose for all water samples were significantly lower than the USEPA and WHO recommended respectively. The environmental effects of radioactive radon gas are almost non-existent, because the lifetime risk of cancer in all samples is less than the permissible safety limit for healthy drinking water, and therefore it does not affect human health.
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