Fig. 2

X-ray photon spectra. The 100-kVp spectrum ranges from 10 to 100 keV with a bin size of 0.05 keV and the 200-kVp spectrum from 20 to 200 keV with bin size 0.1 keV. The energy for each created particle is chosen randomly based on the percentages defined by the respective spectrum. Both spectra possess the same four intensity peaks