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故障现象：我院安装的该加速器在正常工作五年后，时常出现出束剂量到了预置数时不能自行停止现象，全靠操机人员监视控制台上的数码管指示按下“停止”键切断出束。因此误差很大，影响疗效。但也非绝对不能自行停机，经多次试验发现：只要预置剂量的十位拨轮拨在“8”以下的数
Symptoms: After five years of normal operation, the accelerator installed in our hospital can not stop automatically when the beam dose reaches the preset number. It depends on the digital tube on the monitor console of the operator to press the “stop” button. Cut out the bundle. Therefore, the error is large and affects the efficacy. However, it is not absolutely impossible to stop by itself. After many tests, it has been found that: as long as the preset dose of ten dials dials the number below “8”