某高速公路绿色通道X射线车辆检查系统环境辐射剂量率计算与实测对比研究

Comparative Study on Calculation and Measurement of Environmental Radiation Dose Rate of X-Ray Vehicle Inspection System in Green Channel of an Expressway

本文以某高速公路收费站绿色通道X射线车辆检查系统为例,参考《工业X射线探伤室辐射屏蔽规范》(GBZ/T 250—2014)中的计算公式对关注点进行辐射剂量计算,并采用实际监测结果进行验证,同时计算驾驶位一次通过该系统所受辐射剂量。结果显示:该检查系统在合理划分两区后,辐射剂量率满足相应限值要求,且正常工况下,货车一次通过所受辐射剂量较小。研究结果还显示,关注点处辐射剂量率的计算结果与监测结果比较吻合,说明本文选用的计算方法和选取的参数可行,可为同类项目的环境影响评价提供技术参考,同时,本文对车辆检查系统的辐射防护进行了探讨,得到了一些有工程应用价值的结果。

This paper takes X-ray vehicle inspection system of green channel of a highway toll station as an example,calculates the radiation dose of the concerned points with reference to the calculation formula in Radiation Shielding Specification for Room of Industrial X-Ray Radiography GBZ/T 250—2014,and verifies it with the actual monitoring results.At the same time,it calculates the radiation dose received by the driver once through the system,and the results show that the radiation dose rate of the inspection system meets the requirements of the corresponding limits after the two zones are reasonably divided,and the radiation dose received by the freight car in one pass is relatively small under normal working conditions.The research results also show that the calculation results of radiation dose rate at the focus are consistent with the monitoring results,which shows that the calculation method and parameters selected in this paper are feasible,and can provide technical reference for the environmental impact assessment of similar projects.At the same time,the radiation protection of vehicle inspection system is discussed,and some results with engineering application value are obtained.