Development and application of continuous ²²²rn detecting device for accumulated damage of uranium rock

Based on the research status of rock mass accumulative damage and summarizing the application fields of ²²²Rn, the Earth's physical and chemical properties of ²²²Rn were tried to be applied in the field of rock damage mechanics, and the cumulative damage of rock mass would be monitored. The ²²²Rn continuous detection uranium ore rock accumulation test device was designed. Firstly, the device simulates the cyclic blasting load by preparing uranium ore test blocks and carrying out multiple blasting by similarity theory. Secondly, the longitudinal wave velocity of the test block before and after blasting was obtained by using a non-metallic ultrasonic detector, and the cumulative damage evolution of uranium ore rocks under cyclic blasting load was analyzed; Then the ²²²Rn measuring instrument was used to continuously measure the variation of accumulated ²²²Rn concentration caused by cyclic blasting load, and the data were processed to obtain the ²²²Rn exhalation rate. Finally, it is concluded that the kind of uranium ore rock cumulative damage characteristics and continuous change of the relationship between the ²²²Rn exhalation rate, can further verify surface ²²²Rn gas is used to detect the feasibility of uranium loaded rock cumulative damage, as to provide the theoretical basis for prevention and control of uranium mine ²²²Rn radiation.