Radon is a naturally occurring radioactive gas that is emitted from soils and rocks and is in some water sources. Radon is estimated to cause many thousands of deaths each year. That's because when humans breathe air containing radon, can get lung cancer or when drink water containing radon, this element makes series problem to digestion system. Also, drinking water containing 226Ra, the parent nuclide of 222Rn, is dangerous for people health. Because this element deposits it in bones and caused to bone cancer. In this study radon and radium concentrations of the 43 water samples of the Sadatshar and Javaherdeh regions have been measured by PRASSI system. 4 samples have radon concentration higher than 11 Bq/l as normal level. Also, 226Ra alone, in 2 samples have concentration higher than 0.555 Bq/l as normal level for gross alpha. For improvement of the social health level, it is essential that to reduce the radon and radium concentrations in the drinking water before using by

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