Figure 3
Comparison of yD values between this work and reference data. (A) Is for electrons in the range of kinetic electron energy from 0.1 to 1000 keV and (B) for two photon spectra of 200 kVp and 6 MV X-rays (at 10 cm depth from surface in in-field region). In (A), we assumed two physical conditions: one is for considering all electron collision processes, excitation (electronic), ionization, attachment, vibrational excitation and elastic scattering (blue triangle), and the other for only three processes of excitation (electronic), ionization, and elastic scattering (red circle). The results of GEANT4-DNA (option5) reported by Famulari et al.3 are plotted as reference (white square). The results of WLTrack (exc, ion, elas) exhibit approximately 70% lower than those of WLTrack (exc, ion, att, vib, sub, elas), whilst the yD values calculated by WLTrack (exc, ion, att, vib, sub, elas) for both photon spectra agree well with the measured data by tissue equivalent proportional counter (TEPC) reported by Okamoto et al.15. Standard errors of all calculation were based on three independent calculations.
