摘要
通过对隧道地表沿线野外现场监测、取样检测及室内综合分析等手段,对新建铁路穿越隧道段进行放射性水平调查和研究,以评价辐射环境在隧道施工过程中对人员的辐射影响。结果表明:隧道沿线地表γ辐射剂量率均值为186.5nGy/h;地面伽玛能谱测量^(238)U、^(232)Th、^(40)K均值分别为37.7Bq/kg、83.1Bq/kg、1023Bq/kg;土壤氡浓度均值为4936Bq/m^(3);沿线空气氡浓度平均值为27.8Bq/m^(3)。根据测量结果估算隧道施工期间人员所受年均有效剂量为0.73mSv。隧道沿线放射性水平基本正常,但存在有相对偏高地段,在隧道施工过程中应做好跟踪监测和个人防护。
The radioactivity level of the crossing tunnel section in the new high-speed railroad was investigated and studied by means of field monitoring along the tunnel surface,sampling and testing,indoor comprehensive analysis and so on,to evaluate the radiation impact of the radiation environment on the tunnel construction process on personnel.The results show that the average value of y radiation dose rate along the tunnel surface is 186.5nGy/h;the average values of ^(238)U,^(232)Th and ^(40)K measured by ground y-ray spectrometric survey are 37.7Bq/kg,83.1 Bq/kg and 1023Bq/kg,respectively.The average value of soil Radon(Rn)concentration is 4936Bq/m^(3);The average value of air Rn concentration along the tunnel is 27.8Bq/m^(3).According to the results,annual average effective dose to personnel during the tunnel construction is estimated to be 0.73 mSv.The radioactivity level along the tunnel is basically normal,but there are relatively high sections,so follow-up monitoring and personal protection should be done during the tunnel construction.
作者
刘自超
张超辉
王亮
谭建祖
LIU Zi-chao;ZHANG Chao-hui;WANG Liang;TAN Jian-zu(Anhui Nuclear Exploration Technology Central Institute,Wuhu Anhui 241000;No.209 Team,Yunnan Nuclear Industry,Kunming 650000)
出处
《四川地质学报》
2023年第1期158-162,共5页
Acta Geologica Sichuan
关键词
高速铁路隧道
放射性
调查评价
high-speed railway tunnel
radioactivity
investigation and evaluation
