谭红汕, 王桂敏, 姜永根, 郑懿, 王彦梅, 孙中兴, 蒋元强. 上海市地铁站X射线行李包检查系统辐射水平监测结果分析[J]. 环境与职业医学, 2013, 30(6): 416-419.
引用本文: 谭红汕, 王桂敏, 姜永根, 郑懿, 王彦梅, 孙中兴, 蒋元强. 上海市地铁站X射线行李包检查系统辐射水平监测结果分析[J]. 环境与职业医学, 2013, 30(6): 416-419.
TAN Hong-shan , WANG Gui-min , JIANG Yong-gen , ZHENG Yi , WANG Yan-mei , SUN Zhong-xing , JIANG Yuan-qiang . Radiation Levels of X-Ray Baggage Inspection Systems in Shanghai Subway Stations[J]. Journal of Environmental and Occupational Medicine, 2013, 30(6): 416-419.
Citation: TAN Hong-shan , WANG Gui-min , JIANG Yong-gen , ZHENG Yi , WANG Yan-mei , SUN Zhong-xing , JIANG Yuan-qiang . Radiation Levels of X-Ray Baggage Inspection Systems in Shanghai Subway Stations[J]. Journal of Environmental and Occupational Medicine, 2013, 30(6): 416-419.

上海市地铁站X射线行李包检查系统辐射水平监测结果分析

Radiation Levels of X-Ray Baggage Inspection Systems in Shanghai Subway Stations

  • 摘要: 目的 掌握上海市地铁站X射线行李包检查系统放射防护基本情况, 以及公众和安检工作人员可能暴露的辐射剂量状况, 为加强放射卫生防护管理工作提供基础资料。

    方法 随机选取上海市6 座地铁站共19 台X射线行李包检查系统, 监测系统外表面0.05 m不同位置, 以及系统入口和出口不同距离、不同角度(包括乘客和工作人员操作位置)空气比释动能率, 对系统放射防护状况和周围辐射剂量进行分析与评价。

    结果 工作人员操作位、乘客通道、系统上盖板、系统乘客通道侧监测值与环境本底值差别无统计学意义(P > 0.05)。系统入口和出口5 个位置中, 下方位置辐射强度最高, 19 台仪器中有3 台监测结果超标; 其次是中间位置空气比释动能率, 有2 台监测结果超标; 系统入口和出口表面平均空气比释动能率最大, 分别为1.585 μGy/h 和0.248 μGy/h, 均显著高于环境本底值, 差别有统计学意义(P < 0.001), 但均未超过5 μGy/h 的限值要求。系统入口和出口随着距离和角度的不断增加, 空气比释动能率不断降低, 其中距离5 m和角度90& #176; 处辐射强度接近环境本底值。

    结论 系统工作时入口和出口存在一定的辐射泄漏, 对公众和安检工作人员影响较小, 但不符合放射豁免要求, 应加强地铁站X射线行李包检查系统的放射卫生防护管理。

     

    Abstract: Objective To evaluate the radiation prevention of X-ray baggage inspection system and possible exposure doses received by the public and the security officers in Shanghai subway stations, in order to provide basic data for radiological health protection and management.

    Methods Nineteen X-ray baggage inspection systems were randomly selected from 6 subway stations in Shanghai to detect the air kerma at 0.05 m from the external surface and at various distances and angles from the inlets and outlets of the inspection system (including spots where passengers and the staff could stand).

    Results The monitoring results at the staff position, the passenger channels, the X-ray machine upper covers, and the X-ray machine covers facing passenger flow showed no statistical difference with the local environmental background level (P > 0.05). At all the 5 sampling spots of the systems inlets and outlets, the air kerma rates at the lower positions were recorded the highest value, with 3 out of 19 systems above the national protection standard; and the middle position showed the second highest, with 2 systems above the standard. The average air kerma rates at the surface of inlets and outlets were 1.585 μGy/h and 0.248 μGy/h, both of which were significantly higher than the local environmental background level (P < 0.001), but still within the limit of 5 μGy/h. With the distance and angle increasing, the air kerma rates were gradually reduced. When the distance was 5 m and the angle was 90& #176; from the center of the sampling doors, the radiation intensity was close to the local environmental background level.

    Conclusion The possible level of radiation leakage of X-ray baggage inspection system is low and poses minor health hazard to the public and the security officers, but the current inspection protocol doesn't meet the radiation exemption requirements, and therefore need to strengthen the X-ray inspection management.

     

/

返回文章
返回