Abstract: During the mining process of radioactive minerals and their associated radioactive minerals, the crushing of rocks alters the original physical structure of the ores, leading to changes in the radon emanation coefficient and its migration characteristics. This causes environmental issues such as excessive radon emissions from tailing. Determining the radon emanation coefficient of tailing and studying the main factors affecting the emanation coefficient are of great significance for the protection and management of radon in tailing. This paper focuses on the radon emanation coefficient of uranium mine tailing, establishes a measurement device for the emanation coefficient, and uses the device to measure the emanation coefficient of samples under different particle sizes and temperature conditions. Based on experimental data, relationships and empirical formulas between emanation coefficient and temperature and particle size were established. The experimental results show that within the particle size range of 5 to 30 mesh, the emanation coefficient is in a power-law relationship with the sample size, thus increasing as the sample size decreases; there is a positive correlation between the emanation coefficient and temperature, with a certain linear relationship within the temperature range of 20-40 °C. The empirical formulas derived in this paper can be used for simulating radon concentration in uranium mine tailing, providing basic data for the management of radon in tailing.

Key words: uranium mine tailing, radon, temperature, particle size, emanation coefficient