The largest fraction of the natural radiation exposure we receive comes from a radioactive gas, radon and its decay products (nearly 50%). The radon gas can enter to the body via respiring, drinking and eating and caused damage to respiratory and digestion systems. Also radium-226 is widely distributed in the environment. When a person ingests radium, this element deposits in bones and cause to bone cancer. In this study radon and radium concentrations of the 77 water samples of Ramsar city in Iran have been measured by PRASSI system. 7 samples have radon concentration higher than 11 Bq/l as normal level. Also, 226Ra alone, in 5 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

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