口岸通道式旅客通关核辐射风险因子快速监测方法研究

Study on Rapid Monitoring Method of Nuclear Radiation Risk Factors in Passenger Passage at Port

核辐射风险因子监测是口岸监管的重点和难点之一,传统核辐射探测设备效率低,易误检。本文旨在研究和综合评估一种利用放射性物质成像定位技术的口岸通道式核因子快速监测方法。基于编码板成像原理的核辐射成像模块,通过图像重建获得核辐射分布图像,并与光学图像融合获得核因子的空间分布图像,用于快速定位监测。该设备优于3帧/s成像速度、2°定位精度、30μSv/h灵敏度的指标要求。在海关某口岸出入境大厅装机应用96个月,分析查验数据,统计结果为平均单季度阳性案例约260次,平均日阳性案例3次。结果表明,基于编码板成像技术开发的通道式放射性物质成像定位仪,可以有效实现旅客口岸快速通关情境下的核辐射精准查验,具有成像快速、准确和灵敏的优点,适用于口岸核辐射风险因子精准监测。

Monitoring of nuclear radiation risk factors is one of the key and difficult points of port supervision.Traditional radiation detection equipments inefficient and easy to misdetect.This paper aimed to study and comprehensively evaluated a portchannel nuclear factor rapid monitoring method using radioactive material imaging and positioning technology.The nuclear radiation imaging module based on the principle of coded aperture imaging can obtain the nuclear radiation distribution image through image reconstruction,and the spatial distribution image of nuclear factors can be obtained by fusion with optical image,which is used for fast positioning monitor.The equipment was superior to 3 frame/simaging speed,2°positioning accuracy and 30μSv/h sensitivity.The equipment was installed in the entry-exit hall of a certain customs port and operated for 96 months to analyze the inspection data.The statistical results showed that the average number of positive cases were about 260 per quarteror 3 per day.The results show that the radioactive material imaging and positioning equipment based on coded aperture imaging technology can effectively realize the accurate inspection of radiation for the rapid customs clearance at passenger ports.It is fast,accurate and sensitive,which is suitable for precise monitoring of nuclear radiation risk factors at ports.