[Gate-users] Bremsstrahlung not working properly

[Christopher Oldfield]

Dear Gate users,

I have been trying to simulate bremsstrahlung imaging of an electron source but have found that the photon energy spectrum coming out of GATE is noticeably different to the spectrum measured experimentally, primarily at energies below 150 keV.

This disagreement is found in GATE 6.1 with Geant4.9.3, GATE 6.2 with Geant4.9.5 and the latest version of GATE 7.0 with Geant4.9.6.

The simulation geometry and physics has been verified with gamma sources and matches experimental measurements well.

Has anyone else experienced this problem?

Thanks
Chris
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