Abstract:In order to understand the radioactivity level around the decommissioned uranium tailings pond, the surface radon exhalation rate, gamma air absorption dose rate and the contents of radium and uranium in the water during the periods of abundant water, normal water and dry water were measured, and compared with the standard limits. Meanwhile, the single factor index method was used to analyze the pollution of the data. The results show that the gamma radiation dose rate of uranium tailings pond is lower than the prescribed limit value (69.8+174 nGy/h), with an average value of 45.6 nGy/h, resulting in an annual effective dose equivalent of 0.09 mSv for the local residents. The average surface radon emission rate is 0.43 Bq/(m2.s), which is lower than the specified limit of 0.74 Bq/(m2.s). It is concluded that the treatment of the air environment of the uranium tailings pond has achieved good results. For the 30 water sample points measured, the content range of radium in the water during abundant season, normal season and dry season are 0.002~0.93 Bq/L, 0.005~2.02 Bq/L and 0.004~1.07 Bq/L, respectively. Uranium content ranges from 0.91 to 134 μg/L, 0.26 to 78.5 μg/L and 1.04 to 435 μg/L respectively. The content of 226Ra did not exceed the regulatory limit of 1.11 Bq/L for uranium mining and metallurgy industry in China, the content of uranium only individual points more than 50 μg/L. Through the pollution analysis by single factor index method, it is concluded that both standard index of uranium and radium-226 standard index, the flat season is better than the wet season, and the wet season is better than the dry season.