Abstract
Stopping-power ratios for water to air, s(w,air), have been calculated for 60Co and thin-target bremsstrahlung beams. The Monte Carlo method was used to generate depth-dependent s(w,air) values and depth-absorbed-dose distributions in water for monoenergetic photon beams covering the energy range 0.1-50 MeV. An averaging procedure has been developed to derive the stopping-power ratios for a photon spectrum from the monoenergetic data. Values of the Spencer-Attix ratio for Delta =10 keV, s(w,air)SA ( Delta =10 keV), and the Bragg-Gray ratio, s(w,air)BG, evaluated using the new I values and two different sets of values for the density effect correction, are given at the reference depths recommended in the dosimetry protocols.
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