Dear Colleagues
As we experienced in our comaprison studies between different Monte Carlo codes, Geant4 gives higher devaiation in low level energies with standard XCOM data.. According to my experiences with MC codes, it can be due to structure of Geant4 which has been created for high energy simulaons such as LHC or Atlas experiment.. On the other hand, MCNP gives quite similar results with standart xcom data..Can you share your experiences with Geant4, if somebody has..
Regards..