Dear @soukaina,
Unfortunately, your use case cannot be achieved using existing cards (as you would require a filter/cut in the USRBIN scoring), but can be implemented using a custom user routine. Please find attached an mgdraw_bremsstrahlung.f (11.0 KB) routine that will dump every photon produced in a bremsstrahlung event, together with its coordinates and cosines.
Additionally, your Au_100.inp (1.6 KB) file needs an USERDUMP card to activate the routine, and please recompile your executable and link the routine.
Having all the raw data of photons, you should then be able to filter according to your needs.
Please let me know if there is anything else that I can help with.
Best,
Daniel