Hello @Newconcept_1979
To see the difference between the USRBDX and the USRYIELD, here are some useful resources:
- Physical meaning of USRYIELD
- FLUKA manual USRBDX more specifically notes 2 and 3
- FLUKA manual USRYIELD
To come back to your plot, in the case of the USRBDX, it has been integrated integrated over the solid angle (as explicated by flair). Then is you divide by you solid angle 2pi * (1 - sqrt(3)/2) ~= 0.8417872144769, you obtain the same curves.
Let me know if you need more explanations.
