贵阳市地铁一号线氡浓度水平调查及其评估

Survey and Assessment of Radon Concentration in Guiyang Metro Line 1

本文对贵阳市地铁一号线氡浓度水平进行调查和评估,地铁站点的实测氡浓度为3.33~23.22 Bq/m^(3),平衡当量氡浓度为1.33〜9.29 Bq/m^(3),低于标准控制值要求,与国内其他城市地铁站氡浓度水平相当。对吸入氡及其子体产生的年均有效剂量进行了估算,氡及其子体所致地铁工作人员个人剂量估算结果为0.11 mSv/a,低于有效剂量目标值要求。从辐射防护最优化角度考虑,应尽可能降低地铁站氡及其子体这一不必要的照射,应在工程勘察阶段、建设阶段、验收阶段和运行阶段采取防氡措施,今后应开展地铁站氡浓度随各种因素的变化规律研究。

This paper investigates and evaluates the radon concentration level of Guiyang Metro Line 1.The actual radon concentration at the subway station is 3.33〜23.22 Bq/m^(3),and the equilibrium equivalent radon concentration is 1.33〜9.29 Bq/m^(3).It is lower than the standard control value requirement,which is equivalent to the radon concentration level of subway stations in other cities in China.The annual average effective dose of radon and its progeny was estimated.The estimated personal dose of subway workers caused by radon and its progeny was 0.11 mSv/a,which was lower than the target value of effective dose.From the perspective of radiation protection optimization,the unnecessary exposure of subway stations and their descendants should be reduced as much as possible,and radon prevention measures should be taken during the engineering survey,construction,acceptance and operation stages,and subway stations should be developed in the future.Study on the variation of radon concentration with various factors.