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. Author manuscript; available in PMC: 2022 Jan 1.
Published in final edited form as: Med Phys. 2020 Dec 12;48(1):19–56. doi: 10.1002/mp.14226

FIG. 2.

FIG. 2.

Comparison of the attenuation coefficients for each individual photon process: Rayleigh scattering (top left), photoelectric effect (top right), Compton scattering (bottom left), gamma conversion (bottom right). The plots show the attenuation coefficients as calculated using Geant4 against the NIST XCOM data; the ratio of Geant4 results and the reference data is shown as well. The black dashed lines in the lower plot represent the uncertainties of the NIST XCOM data (σref). The statistical uncertainty affecting the Geant4 simulation results is below 1%.