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Figure 4
Dose distribution of a microfocus X-ray beam in soft tissue simulated with the EGSnrc MC code. In order to show all the relevant phenomena in a single figure, the z-axis in the direction of the incident photons is plotted on a logarithmic scale. In the beam direction, the dose distribution is determined by the buildup effect for z < R, remains approximately constant for [R \,\,\lt\,\, z \ll \mu^{-1}] and finally drops to (close to) zero for z = [{\cal O}(\mu^{-1})]. In the radial direction, the extent of the region receiving relevant dose is determined by the photoelectron range R. Due to the generation of secondary photons (Thomson scattering, fluorescence, bremsstrahlung), there is some dose for r > R.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 26| Part 4| July 2019| Pages 980-990
https://doi.org/10.1107/S1600577519006817
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