论文部分内容阅读
目的通过测算某输水隧洞作业人员氡子体的累积暴露量,探讨氡引起的职业照射水平与致肺癌的关系。方法分别采用氡和氡子体测量仪器,对现场关注点的氡及其子体水平进行了测量,采用被动式累积探测器对隧洞内氡、钍射气浓度水平进行了检测及数据分析。结果隧洞内关注点氡及平衡氡浓度分布呈现了凌晨高于午后的特点,初步分析了隧洞中氡及钍射气来源,氡子体总暴露量约为49.7 WLM,估算有效剂量约为497 mSv。结论从氡及其子体暴露的个案角度分析,在较短的时间内,作业人员接受氡及其子体暴露量的迅速增加。考虑到同时处于恶劣的隧洞施工条件下(单向掘进通风不良,生产性粉尘暴露量高,隧洞内未采用防氡、降氡措施,引水隧洞内气溶胶水平居高不下等),高氡子体暴露和生产性粉尘(游离SiO_2和ThO_2)对职业性肺癌可能具有协同作用,亟需开展职业性肺癌危害的进一步研究。
OBJECTIVE: To estimate the cumulative exposure of radon progeny to workers in certain water diversion tunnels and to explore the relationship between occupational exposure caused by radon and lung cancer. Methods Radon and radon progeny measuring instruments were respectively used to measure the levels of radon and its progeny at the site of interest. The passive cumulative detector was used to detect and analyze the concentration of radon and thoron in the tunnel. Results The distribution of radon concentration and radon concentration in the tunnel was higher than that in the early afternoon. The sources of radon and thoron in the tunnel were analyzed. The total exposure of radon was 49.7 WLM and the estimated effective dose was about 497 mSv . Conclusion From the perspective of individual cases of exposure to radon and its daughters, workers exposed to radon and its daughters increased rapidly in a relatively short period of time. Considering that at the same time in the harsh conditions of tunnel construction (unidirectional ventilation poor ventilation, high dust production exposure, the tunnel did not use anti-radon, radon lowering measures, diversion tunnel aerosol level is high, etc.), high radon Body exposure and productive dust (free SiO_2 and ThO_2) may have a synergistic effect on occupational lung cancer and further research on the hazards of occupational lung cancer is urgently needed.