Dear @thanapong
First of all, welcome to the FLUKA User Forum.
About your questions, let me start with the second one:
-
USRBDX scoring is a boundary crossing detector, meaning that it is used to score fluence or current crossing the boundary between two regions. These regions must be specified when defining the USRBDX scoring. I can see that in your input you are trying to get the fluence of neutrons going from region “TARGET” to region “VOID”, the problem is that these two regions do not share a boundary (they are not in contact), so there are no neutrons coming out from region “TARGET” entering directly in region “VOID”. All neutrons leaving “TARGET” must go through region “tarclad” or region “block” before they can reach region “VOID”.
Also note that if you only score those neutrons going from region “tarclad” to “VOID” you will miss those going from “block” to “VOID”.
With respect to the neutron properties:
- It is difficult to tell if you extracted correctly the properties you mention because you didn’t attached your fluscw.f routine, so I don’t know how is your implementation of this routine and I am not sure to what correspond the data in each column of your *TXT file.
But in any case, if I understood correctly, you are interested in the neutrons escaping from your target cladding, so I would use the mgdraw.f routine (https://flukafiles.web.cern.ch/flukafiles/manual/13.2.13.html) and in particular its BXDRAW entry, which will be called every time a particle crosses a boundary provided that you have correctly included the USERDUMP card (https://flukafiles.web.cern.ch/flukafiles/manual/USERDUMP.html). Note that you will need to customize this routine in order to implement your logic to identify those neutrons escaping from your region(s) of interest and to output any information you are interested in (you may also want to remove some of the code to avoid that unnecessary information is printed out). Maybe the follwing post is also interesting for you: Energy and angle of each particle escaping from the surface.
Note that by doing this you will not need to include a USRYIELD scoring.
Cheers,
Francisco