目前，放射治疗设备主要有电子直线加速器、钻60治疗机、模拟定位机、后装治疗机等。我们应当定期地、严肃认真地对放疗设备的重要参数进行测定和校准。一、百分深度量的测定定义：体模中线束中心轴上某一深度处吸收剂量DX与某一固定参考点吸收剂量Do之比，即为百分深度量。Dd At present, radiotherapy equipment mainly includes an electron linear accelerator, a drill 60 treatment machine, an analog positioning machine, and a post-loading treatment machine. We should regularly and seriously measure and calibrate important parameters of radiotherapy equipment. Determination of the Percent Depth Amount: The ratio of absorbed dose DX at a certain depth on the central axis of the phantom to the absorbed dose Do of a fixed reference point is the percent depth. Dd