高灵敏度行人辐射监测仪在核电厂出入控制口的应用

Application of High Sensitivity Pedestrian Radiation Monitor in the Access Control of a Nuclear Power Plant

为了进一步提高某核电厂出入控制口辐射监测性能和效率,选用国内新一代高灵敏度辐射监测仪,并实施适应性改进。将原有门板型设计改造为多探测器前后布置的门框式设计,实现全身分区域测量和报警;对百分比报警、效率报警、最大灵敏度报警进行测试,选择效率报警作为优选报警方式。改进后,实现了探测灵敏度和通行效率二者兼得:探测报警阈值从108 kBq降低至3 kBq,监测更加精准;采用的通行式设计可使行人无障碍通过,通行能力约为144人/分钟,兼顾了通行效率和安全检测。

In order to further improve the radiation monitoring performance and efficiency of the access control in a nuclear power plant,a new generation of high sensitivity pedestrian radiation monitor in China is selected and the adaptive improvement is implemented.The original door panel design is transformed into a door frame design with multiple detectors arranged in front and back to realize the whole body measurement and alarm in different areas;the percentage alarm,efficiency alarm and maximum sensitivity alarm are tested,and the efficiency alarm is selected as the optimum alarm mode.After improvement,both detection sensitivity and efficiency are achieved:the detection alarm threshold value is reduced from 108 kBq to 3 kBq,and the monitoring is more accurate;the adopted passway design can make pedestrians pass through without obstacles,with a capacity of about 144/min,balancing the efficiency and the safety.