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Figure 3
Top (a): ionization distributions in xenon gas, stemming from X-rays interacting in an infinite volume. They are obtained after aligning each X-ray ionization cloud by its barycenter, and projecting it over an arbitrary axis. Calculations from Geant4 are compared with the microscopic code DEGRAD developed by S. Biagi (Biagi, 2020BB15). Top (b): probability of characteristic X-ray emission in xenon for an incident photon energy of 30 keV (red) and 64 keV (blue), in Geant4. The K-shell (green) and L-shell (orange) lines, as tabulated in Thompson et al. (2001BB44), are shown for comparison. Bottom (a): transverse size of a point-like ionization cluster after drifting along 50 cm, obtained from Magboltz. Bottom (b): longitudinal size of a point-like ionization cluster (in time units), in the same conditions. Results for pure xenon and a fast `counting' mixture based on Xe/CH4 are shown for comparison.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 28| Part 5| September 2021| Pages 1558-1572
https://doi.org/10.1107/S1600577521005919
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