Investigation on Radon Release Characteristics of an Acid In-situ Leaching Uranium Mine
Investigation on release characteristics of radon concentration,radon release amount,migra-tion and diffusion trend of radon of an acid in-situ leaching uranium mine was carried out on the basis of data collection and field investigation.This study monitored radon concentration of source items and surrounding environment on uranium milling plant vents,leaching tanks,evaporation ponds and recovery wells with adoption of E-Perm electret detector,solid track detector and RAD7 radon detec-tor.The results show radon concentration level is highest at top opening of leaching tanks,neverthe-less affected area is no more than 500 m.Lowest radon concentration appeare at point of recovery wells.The annual total radon release of the acid in-situ leaching uranium mine is about 1.75 TBq/a,milling plant and leaching tanks are important radon release source items,which accounte for 58％and 39％of the total ra-don release respectively,additionally radon release of recovery wells and evaporation ponds account for 3％of the total radon release.In summary,the normalized annual radon release amount of the acid leaching uranium mine is much smaller than that of underground mine exhaust shaft.
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