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目的调查湖南某铅锌金矿井下放射性水平,评价放射性危害程度及来源。方法对井下不同位置γ剂量率以及氡浓度进行实地测量,估算井下工作人员所受年有效剂量。结果井下矿区γ剂量率范围为(0.05~0.63)μSv/h。累积测量氡浓度范围为(52~721)Bq/m~3,井下工作人员所受最大年有效剂量约为4.84 mSv。结论根据本次调查,该矿井下工作场所氡浓度较高,存在放射性危害,应采取相应防护措施。
Objective To investigate the radioactivity level of a lead-zinc-gold mine in Hunan Province and evaluate the degree and sources of radioactive hazards. Methods The γ dose rate and radon concentration at different positions in the mine were measured on the spot and the annual effective dose of downhole staff was estimated. Results The range of γ dose rate in underground mine is (0.05-0.63) μSv / h. The cumulative measured radon concentration ranged from 52 to 721 Bq / m ~ 3, and the maximum annual effective dose suffered by downhole workers was about 4.84 mSv. Conclusion According to this investigation, the underground radon concentration in this underground mine is high, and there is radioactive hazard. Appropriate protective measures should be taken.