Abstract:Uranium tailings pond belongs to special nuclear facilities and is the main environmental radiation pollution source of uranium mining and metallurgy system of nuclear industry. Radon control in beach surface of uranium tailings pond has always been a major problem in ecological environment restoration. A stack physical model was used to analyze the characteristics of radon exhalation and temperature and humidity on beach surface of uranium tailings pond after soil covering and vegetation restoration, and effects of vegetation cover on temperature change and radon exhalation rate on beach surface were analyzed by R/S analysis method. The results show that after vegetation restoration, both the change of beach surface temperature of uranium tailings pond and radon exhalation rate drop. After vegetation coverage, the radon exhalation rate remains below 0.31 Bq/(m2?s), which the peak value of radon exhalation rate drops by 74% and 45% compared with single-layer laterite coverage and multi-layer laterite coverage respectively. The fluctuation degree of radon exhalation rate drops, and the fluctuation degree of single-layer laterite coverage and the standard deviation of radon exhalation rate of multi-layer soil overburden is 0.345 and 0.123 Bq/(m2?s) respectively. When the average plant height is 17 cm and 30 cm, the standard deviation of radon exhalation rate is 0.027 and 0.062 Bq/(m2?s) respectively. The fluctuation range of radon exhalation rate drops and the stability rises. This study analyzes the impact of vegetation cover on the beach surface of uranium tailings pond from two aspects, i.e., the temperature change of beach surface of uranium tailings pond and the fluctuation degree of radon exhalation rate, so as to provide technical support for ecological restoration scheme of uranium tailings pond.