Dear @ceruttif,
Thank you for your reply. Inhibiting photon production indeed reduced the range, although still remained a bit higher than ESTAR’s, which as you said must be due to energy loss fluctuations. I suppose my concern was, that even though these fluctuations exist, the range should still be lower than ESTAR’s, as FLUKA includes multiple scattering, secondary production, energy straggling etc. After all, isn’t this the reason it is advised to consult ESTAR before creating a USRBIN mesh, since its range is always an overestimation (not accounting for secondary production)?
Thank you,
Fitilis