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On the calculation of mean restricted collision stopping powers
1Department of Radiation Oncology, University of Florida, College of Medicine, Gainesville 32610-0385, USA. tomewa@bolus.health.ufl.edu
Abstract:
An analytical method for the calculation of ratios of mean restricted collision stopping powers (L/rho)(g)m averaged over the charged particle spectra and the photon spectrum that is accurate to first order has been developed, and it has been explored whether a moderate change in the photon fluence spectrum with field size has an effect on the mean restricted collision stopping power ratio in high-Z materials. The results of this study indicate that for the case of a miniphantom, moderate changes in the photon fluence spectrum have only a weak effect on the ratios of mean restricted collision stopping powers.