Abstract
This study focuses on the estimation of cleanup level to the mineral naturally occurring Radioactive pollution according by RESRAD to one tailings dam includes the followings parts: confirming the dose constraint value, the analyses on the irradiation scenarios, the settings of the exposure pathways, the settings of the related model parameters, cleanup level simulation estimation by computer and analysis the estimation results. The results of the cleanup estimation show that the irradiation dose value of 232Th and its long-lived daughters is about to 10.7mSv/a, which is exceeded far away the threshold dose value 0.25mSv/a,so the site must be do some cleanup work before its opening. Meanwhile, the result of the cancer risk is about 0.024, that far away the hope of human. RESRAD reveals that the cleanup level of 232Th is 0.047Bq/g in tailings dam soil when the dose limit is 0.25 mSv/a.
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