本文叙述了高能电子束在临床治疗上剂量分布的特点。从体表到一定深度相当宽的区域内剂量是近似平坦的,然后是以很大的梯度下降至本底。电子束的剂量分布受加速器和限光筒很大的影响,这要求对剂量分布作准确的刻度。文中给出了体模内电子束吸收剂量的刻度表达式,指出了影响刻度精度的因素。其中CE(E_z)一电离量与吸收量的转换因子,和探测器的扰动校正因子可以用体模内 This article describes the characteristics of high-energy electron beam dose distribution in clinical treatment. The dose from the body surface to a fairly wide area is approximately flat and then drops to the background with a large gradient. The dose distribution of the electron beam is greatly influenced by the accelerator and the light-limiting cylinder, which requires an accurate calibration of the dose distribution. In this paper, the scale expression of electron beam absorbed dose in phantom is given, and the factors affecting the accuracy of scale are pointed out. One CE (E_z) a ionization and absorption of the conversion factor, and detector disturbance correction factor can be used in vivo