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大型集装箱检测系统是当前用于反走私的先进设备之一。它采用Ｘ射线扫描原理，射线被准直成扇形束，在加速器给束的情况下对被检测的集装箱进行扫描，每次照射时间不超过１ｍｉｎ。这种高度准直和间歇式辐照与一般工业辐照加速器的工作状况是不同的。本文介绍的清华大学１∶１大型集装箱检测系统是一实验研究设备，其屏蔽设计由于采用三次准直，加大了射线的准直度，使每次检测被检物所受辐射剂量降低到不大于１５０μＧｙ的水平
Large container inspection system is currently one of the advanced equipment for anti-smuggling. It uses the principle of X-ray scanning, the beam is collimated into a fan-shaped beam, the accelerator to be detected in the case of the container to be scanned, each irradiation time of not more than 1min. This high degree of collimation and intermittent irradiation with the general industrial irradiation accelerator working conditions are different. The 1: 1 large-scale container inspection system of Tsinghua University introduced in this paper is an experimental research equipment. Due to its three-stage collimation design, the screening design of the Tsinghua University has increased the collimation of the radiation so that the radiation dose to be tested will be reduced to no Greater than 150μGy level