Thanks for your solution. Now photons deposit energy within the detector.
One more question, considering the dimension of the planar source ( 30x60 cm2) is slightly bigger than the cylindrical Aluminum detector container(R=15cm, H=50cm), why the scoring quantity (USRBDX : Exp_Hall to Al_cont) is in the order of 0.001? Assuming it is proportional to the ration of the cross-sectional area of the container(30x50=1500cm2) to the area of the planar source(30x60=1800cm2)
The following picture is the result of the scoring quantity(USRBDX : Exp_Hall to Al_cont), input file with modification(EMFCUT) is also attached.
the issue is in your case, that you didn’t specify the energy range in your scorings, so FLUKA took the default values: E_{min} = 0.0, and E_{max} = E_{beam}.
Probably due to the numerical precision error in this case, the energy of primary particles fall outside the scoring energy range.
If you set the E_{max} to 30 keV, then you will get a result matching the expectations.
Thanks for your reply!
So it is the numerical precision with the USRBDX Scoring or my computer, no relation to the geometry modeling. Checked my geometry again, no error found so far.
there is nothing wrong with your computer or simulation. The issue is how floating point numbers work in any software.
To avoid these issues, it is best practice to always specify a higher scoring energy limit than the expected (beam) energy.
