本文提出了~(60)COγ射线百分深度剂量公式和源瘤距百分深度剂量公式。使之可以完全摆脱传统的、繁琐而又困难的百分深度剂量和组织空气比的测量。本公式所需的实验测定量少,使用范围广,计算精度较高。在源皮距20厘米～100厘米,照射野面积4×4平方厘米～20×20平方厘米广泛范围内与通用的~(60)Co数据作了比较,最大点的误差 In this paper, the formula of ~ (60) COγ ray percent depth dose and the formula of percentage of depth of source tumor are presented. So that it can completely get rid of the traditional, cumbersome and difficult percent depth dose and tissue air ratio measurement. This formula requires less experimental measurement, the use of a wide range of high accuracy. In the source skin from 20 cm to 100 cm, the irradiation field area of ​​4 × 4cm2 ~ 20 × 20cm2 with a wide range of common ~ (60) Co data were compared, the maximum point of error