Radon (~(222)Rn) found in uranium mine shaft ventilation exhaust gases could pose hazards to the surrounding environment and the public by virtue of its progeny. Numerical calculations of the physical model for uranium mine under complex terrains were conducted to evaluate atmospheric dispersion and radon concentration distribution from the ventilation shaft using CFD methods. Factors of the two directions of atmospheric wind and four release height conditions (1, 3, 5 and 8 m) were considered to research radon dispersion in the study. Results showed that radon pollution in the North wind direction was more serious than in the South wind direction and radon concentration differences decreased with the increase of radon dispersion distance. The distance of radioactive contaminant transportation from shaft outlet exhaust was positively correlated with the release height within the region of 100 m. With the increasing release heights, the radon concentrations had a significant decline at a distance of 200 m.
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