新疆某露天煤矿放射性水平调查及人员受照剂量评价  

Investigation of radioactivity level in an open-pit coal mine in Xinjiang,China and evaluation of personnel exposure dose

作　　者：许慧萍[1] 赵洋 XU Huiping;ZHAO Yang(China Institute of Atomic Energy,Beijing 102413 China)

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《中国辐射卫生》2023年第1期6-9,14,共5页Chinese Journal of Radiological Health

摘　　要：目的 对新疆某开采多年的伴生放射性大型露天煤矿的各场所γ剂量率水平和氡浓度水平进行调查和分析;并评价从业人员所受有效剂量。方法 采用便携式γ剂量率仪FH40G对矿区进行定点监测,利用连续测氡仪对场所内氡浓度水平进行24 h连续监测;并根据测量的γ剂量率和氡浓度估算人员受照剂量。结果 该露天煤矿γ剂量率范围为51.4~435.8 nGy/h,氡浓度24 h平均值为15~25 Bq/m^(3),人员年有效剂量范围为0.29~1.29 mSv/a。结论 各场所氡浓度水平较低,不需要采取补救行动;大部分场所人员受照剂量远远低于标准要求,排土场局部地区需要采取一定的防护措施。Objective To investigate and analyze the levels of γ dose rate and radon concentration at all sites in a large open-pit coal mine with radioactivity that had been mined for many years in Xinjiang,China,and to estimate the effective dose exposed to the personnel.Methods A portable γ dose-rate instrument FH40G was used for fixed-point monitoring of the mining area,and a continuous radon detector was used for 24 h continuous monitoring of radon concentration level in the site.The personnel exposure dose was estimated according to the measured γ dose rate and radon concentration.Results In this open-pit coal mine,the range of γ dose rate was 51.4-435.8 nGy/h;the mean 24 h radon concentration was 15-25 Bq/m^(3);the range of annual effective dose to the personnel was 0.29-1.29 mSv/a.Conclusion According to the results of the survey,radon concentration levels at all sites are low,and no remedial action is required.The personnel exposure dose at most of the sites is far below the standard requirements,and some protective measures need to be taken in some areas of the dump.

关 键 词：露天煤矿 Γ剂量率 氡浓度 受照剂量 

分 类 号：X591[环境科学与工程—环境工程]