1. NDZ20医用电子直线加速器，属行波反馈型，采用改变工作频率、相位、磁控管输出功率及束流负载的方法调整能量，电子线能量从5—20MeV分七档，X线有10、15MV两档，并设有AFC，ARC，ADC等自动稳定频率、剂量率和照射野均匀度等控制系统，对一些主要部件达到较为先进的指标。
NDZ 20 Medical linear accelerator is a kind of travelling wave feedback mo-del. Its energy can be adjusted by changing frequency, phase, output rf-power ofmagnetron and beam loading. It has seven electron energy ranges between 5 to 20MeV and two energy ranges of x-ray (10 MV and 15 MV). Some advanced tech-niques such as AFC, ARC and ADC are used automatically to stabilize controlsystem for frequency, does rate and flatteness of field. Some major componentshave advanced parameter.