Peripheral dose from megavolt beams

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Abstract
The peripheral dose (PD), defined as the dose outside of therapeutic radiation beams, was invstigated for 60Co, 4-, 6-, and 10-MV X-ray machines. The measurements 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 [to humans] in some situations. The PD measurements for the various machines are qualitatively similiar, which allows the identification of a simple basic data set which can characterize the PD for any particular machine. The PD was separated into 2 components: in-phantom scatter dose and transmission (leakage) dose. Knowledge of the 2 components is important clinically when shielding is considered.