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位于直线加速器治疗头内的电离室是非常关键的部件，用于测量加速器输出剂量，属剂量测定系统，直接关系到剂量监测的准确性。我院西门子医用电子直线加速器MD7745之X线和电子线模式分别使用不同的电离室，电离室高压为600V。为保证电离室的正常工作，该机设置有系统联锁与安全
The ionization chamber in the treatment head of the linear accelerator is a very critical component for measuring the output dose of the accelerator. It is a dosimetry system and is directly related to the accuracy of dose monitoring. The X-ray and electron-wire mode of Siemens Medical Electronic Linear Accelerator MD7745 in our hospital use different ionization chambers, and the ionization chamber has a high voltage of 600V. In order to ensure the normal operation of the ionization chamber, the aircraft is equipped with system interlocking and safety