Absorbed dose calculations for gamma rays under non charged particle equilibrium conditions

This research used the derived equations for secondary electron energy distributions in water irradiated by gamma rays and the generated electron spectra for different incident photon energies to calculate absorbed doses for non charged particle equilibrium conditions in the dose buildup regions. The pair production contribution is add to the Compton spectrum for 2 to 30 MeV photons. The generated electron spectral data and Spencer's electron energy dissipation distribution data were used to calculate the buildup dose from the skin surface up to the range of the maximum energy electron. The authors then fit their calculated results and obtained the final buildup dose in one exponential form. They present the computed results of 1.25 MeV, 5 MeV and 10 MeV monoenergetic photons for 60Co, 10 MV and 26 MV Linac (Medical linear accelerator) radiations