【摘要】 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的水平更多还原

【Abstract】 Testing facility for large container scanner is a most advanced anti smuggle tool. The X ray scanning principle is adopted in this system. The X ray was collim a ted as a fan shape beam. The accelerator only supplies the ray beam when the container is scanned. The irradiation time is less than one minute per test. The X ray burst irradiation and highly collim a ted scanning beam of this system is different from the common industrial irradiation accelerator. The shielding design of the 1∶1 large container scanner introduced in this paper has better collimation level because of tri collimation. The irradiation dose is less than 150 μGy per test, which is obviously lower than importations. (更多还原