I’ve been struggling to get my code to simulate bremsstrahlung conversion for 90 keV electrons. The electrons are incident on a tantalum target, where this process should occur. This occurs as expected until 94 keV, below which, no x-rays are produced. If I change the material, this threshold changes (i.e. I do see bremsstrahlung interactions at 90 keV with a hafnium target, for example).
I’ve enhanced x-ray production with event biasing, but it appears as though this process just does not occur below 94 keV if my target is made of tantalum. I have no ideas at all what may cause this, or how to fix, so any advice would be appreciated!