Fraass B A, van de Geijn J
Med Phys. 1983 Nov-Dec;10(6):809-18. doi: 10.1118/1.595359.
The peripheral dose (PD), defined as the dose outside of therapeutic radiation beams, has been investigated for 60Co, 4-, 6-, and 10-MV x-ray machines. The measurements have been carried out down to dose levels of about 0.1% of the peak dose in the beam, since that dose level may be of clinical importance in some situations. The PD measurements for the various machines are qualitatively similar, which allows the identification of a simple basic data set which can characterize the PD for any particular machine. The PD has been separated into two components: in-phantom scatter dose and transmission (leakage) dose. Knowledge of the two components is important clinically when shielding is considered.
外周剂量（PD）定义为治疗性辐射束之外的剂量，已针对60钴、4兆伏、6兆伏和10兆伏的X射线机进行了研究。测量已进行到约为束流峰值剂量0.1%的剂量水平，因为在某些情况下该剂量水平可能具有临床重要性。各种机器的外周剂量测量在定性上是相似的，这使得能够识别一个简单的基础数据集，该数据集可以表征任何特定机器的外周剂量。外周剂量已被分为两个分量：体模内散射剂量和透射（泄漏）剂量。在考虑屏蔽时，了解这两个分量在临床上很重要。
