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![[Figure 2]](mo5063fig2mag.jpg)
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Figure 2
Comparison between energy absorption-to-attenuation coefficient ratios calculated for iodine using the EPDL97 database (Cullen et al., 1997  ), simulated using Geant4 (version 9.5) in conjunction with the PENELOPE and Livermore physics models, and as provided by NIST (Berger et al., 2010). The curves corresponding to the Geant4, PENELOPE and Livermore models can barely be distinguished. The relative difference between EPDL97 and Geant4 stays below about 1%. When energy increases, the difference between μtr/ρ (either from EPDL97 or Geant4) and μen/ρ from NIST increases up to about 4% at 1 MeV. In the EPDL97 library the Doppler broadening effect is not considered. It has been shown (Ye et al., 2006) that the usage of this approximation compared with a more advanced model (impulse approximation) does not produce significant differences in the results, at least for the considered energy range. |
![[Figure 2]](mo5063fig2.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
