Studying radon concentration in drinking water resources in Zarand city (Iran) and its villages

The concentration of dissolved radon gas was measured using the RAD7 device in drinking water sources in Zarand city and its villages. The mount of radon in drinking water sources was in the range of 5.16–14.4 BqL−1. The effective dose in all cases was less than the recommended maximum dose of 100 μSvY−1 by the WHO. Very poor linear relationship was found between the depth of wells and the radon concentration of the samples.