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目的探讨延长通风时间和洒水对隧道施工期间氡浓度的影响。方法采用脉冲电离室法对隧道施工期间常规工况和试验工况下的氡浓度进行检测,结果进行相关统计学分析。结果常规通风工况下氡浓度范围为(69~1024 Bq/m3),试验通风工况下氡浓度范围为(62~668 Bq/m3),试验通风加洒水工况下氡浓度范围为(65~608Bq/m3),试验通风和试验通风加洒水工况比常规通风工况下的氡浓度低,差异具有统计学意义。结论延长通风时间和湿式作业均能降低隧道作业场所空气中氡浓度。
Objective To explore the effect of extending ventilation time and watering on radon concentration during tunnel construction. Methods The pulse ionization chamber method was used to detect the radon concentration under normal working conditions and test conditions during the tunnel construction. The results were analyzed statistically. Results The radon concentration ranged from (69 to 1024 Bq / m3) under normal ventilation conditions and from 62 to 668 Bq / m3 under ventilation conditions under test ventilation. The radon concentration range was (65 ~ 608Bq / m3). The experimental ventilation and experimental ventilation plus sprinkling conditions were lower than those under normal ventilation conditions. The differences were statistically significant. Conclusion Extending the ventilation time and wet operation can reduce the concentration of radon in the air of tunnel work place.