2009年上海市地铁车站放射性水平
Radiation Levels in Shanghai Subway Stations, 2009
-
摘要:
目的 了解上海市地铁车站空气氡浓度和环境γ 辐射水平与变化趋势。 方法 于2009 年8 月至12 月,在上海市已开通并在地下运行的地铁线路(1、2、4、6、8 和9 号线)共98 个站点中随机抽取73 个地铁站点,进行环境放射性水平(包括空气氡浓度和环境地表γ 辐射剂量率)检测。瞬时氡浓度检测采用AB-4 连续型氡测量仪,环境地表γ 辐射剂量率检测采用FD-3013H智能化X/γ 辐射仪。 结果 上海市6 条地铁线路各站点空气氡浓度的均值为9.9 Bq/m3,范围为1.2~28.4 Bq/m3,明显低于国家标准规定限值。此外,各站点的环境地表γ 辐射剂量率均值为(0.14& #177;0.02)μSv/h,范围为0.07~0.24 μSv/h,在天然本底辐射水平波动范围内。 结论 上海市投入运营的地铁线路各站点放射性水平属天然本底辐射水平,空气氡浓度明显低于国家标准规定限值。 Abstract:Objective To systematically assess radon concentrations and environmental terrestrial gamma-radiation doses in subway stations of Shanghai. Methods From August to December 2009, 73 stations were selected randomly from 98 stations of Shanghai subway lines, including Line 1, Line 2, Line 4, Line 6, Line 8 and Line 9, which involved underground sections. Instantaneous radon concentrations were measured with AB-4 radon gas monitor, and environmental terrestrial gammaradiation dose rates were obtained with FD-3013H intelligent X/γ radiometer. Results The radon concentrations were in the range of 1.2-28.4 Bq/m3, with the average of 9.9 Bq/m3, which were significantly lower than the national standard. The environmental terrestrial gamma-radiation dose rates were in the range of 0.07-0.24 μSv/h, and the average was (0.14& #177;0.02) μSv/h, within the fluctuations of natural background radiation. Conclusion The radiation level in Shanghai subway stations is within natural background levels, and the radon concentration is obviously below admissible dosage.
下载:
