后装机在使用过程中最常见的故障就是真（假）源参考点故障。下面以国产威达ＷＤ -ＨＤＲ１８型后装机为例 ,介绍一下真（假）源参考点故障的维修。工作原理在治疗机储源铅罐放射源出口处有一个检测放射源是否在铅罐中（安全位置）的装置 ,叫参考光源。它是一个有机玻璃圆盘 , The most common fault in the use of the rear machine is the failure of the true (false) source reference point. The following takes the domestic Weida WD-HDR18 type rear loader as an example to introduce the maintenance of the true (fake) source reference point fault. Working Principles There is a device for detecting the radioactive source in the lead can (safe position) at the outlet of the source of the lead can of the treatment machine, called the reference light source. It is a Perspex disc,