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目的检测某企业X射线行包检查系统辐射水平,估算受检者和工作人员年接触辐射剂量,优化辐射防护措施。方法在X射线行包检查系统出入口、控制位、监督工位、受检者通道等设置检测点,用FD3013H型辐射测量仪对其辐射水平进行测量,同时用秒表对受检人员在行包检查系统工作区域逗留时间进行测量。结果被检查物件进入和移出行包检查系统时,行包出入口处空气比释动能率最高值为2.46μGy/h。距出、入口100 cm处,空气比释动能率最高值为0.78μGy/h。现场监督工位空气比释动能率最高值为0.27μGy/h。行包检查系统控制人员和现场监督人员由此增加的辐射剂量分别为0.1和0.25 mSv/a。受检人员因接受检查,增加的辐射剂量为3.3μSv/a。结论正常工作状态下,该企业X射线行包检查系统的使用不会对工作人员和受检者产生确定性危害效应,但可通过设置防护栏、合理安排监督工位、增设铅胶帘等措施,进一步降低辐射潜在危害。
Objective To detect the radiation level of X-ray parcel inspection system of an enterprise, estimate the annual exposure dose of the examinee and staff, and optimize the radiation protection measures. Methods The detection points were set at entrances, control points, supervisory stations and channels of the X-ray examination, and the radiation level was measured by FD3013H radiation measuring instrument. At the same time, System work area to measure the time to stay. Results When the object being inspected entered and moved out of the baggage inspection system, the highest rate of air kerma at the entrance and exit of the bag was 2.46 μGy / h. At the exit and entrance of 100 cm, the highest rate of air kerma was 0.78 μGy / h. The highest rate of air kerma rate in site supervision station is 0.27μGy / h. The resulting increase in radiation dose by line control system inspectors and field supervisors was 0.1 and 0.25 mSv / a, respectively. Subjects were subject to inspection, an increase of radiation dose of 3.3μSv / a. Conclusion Under normal working conditions, the use of X-ray baggage inspection system of this enterprise will not produce certain harmful effect on staff and subjects, but measures such as setting up protective fence, reasonable supervision station and adding lead glue curtain may be adopted , To further reduce the potential harm of radiation.