广州地铁一号线放射性水平及所致工作人员剂量评价

目的 了解广州地铁一号线放射性水平及所致工作人员有效剂量。方法 采用FD-71A闪烁辐射仪及Rn-Tn探测杯对车站γ辐射水平、²²²Rn、²²⁰Rn累积浓度进行了测量分析,计算了所致工作人员年有效剂量。结果 车站γ辐射水平均值为17.74×10^-8 Gy/h,²²²Rn浓度均值为59.8 Bq/m³,²²⁰Rn浓度均值为32.1 Bq/m³。²²²Rn、²²⁰Rn子体及γ辐射所致工作人员的年有效剂量总和为2.878 mSv/a。结论 广州地铁一号线车站放射性未给地铁工作人员带来额外的放射性剂量负担。

The Evaluation of Radiation level and Dose of Workers in Guangzhou Metro Line 1

Objective To find out the level of radiation and effective dose of workers in Guangzhou Metro line 1.Methods In metro stations, external Gamma-ray exposure rates were obtained by FD-71A radiance measurer, ²²²Rn and ²²⁰Rn concentrations were obtained by using Rn-Tn solid state nuclear track detectors developed by The National Institute for Radiological Protection and Nuclear Safety, Chinese Centre for Disease Control.The annual Effective dose from Gamma、²²²Rn and ²²⁰Rn were calculated.Results The external Gamma-ray exposure average rate is 17.74×10^-8 Gy/h, The average concentration of ²²²Rn is 59.8 Bq/m³, The average concentration of ²²⁰Rn is 32.1 Bq/m³.The total annual effective dose from Gamma、²²²Rn and ²²⁰Rn is 2.878mSv/a.Conclusion In the stations of Guangzhou in metro line 1, no more effective radiation dose to the workers has measured.