Dear @fogallar,
Thank you for replying, sorry for the unclear explanation. My work on fluka is the simulation of impinging the PbBi cylindrical target with a 60MeV proton beam and obtain the neutron source distribution that incident from the proton. My Geometry is the same as refer to the paper’s, with the target zone and subcritical core.
From your reply paragraph 3, “Maybe what you want to do is to score their properties at the moment when the neutrons are created, this way you will obtain them distributed in the volume where they are created.” is totally corrects the idea I want to try. Because I have tried using usryield with target geometry (attach below) and surround it with “RCC” and assign “vacuum” material as your advice here. After I used it coupling to openmc, it shows the fission rate become zeroes, so I think it might be something wrong, and I want to try creating more complex geometry on fluka and scoring by the neutron in volume of geometry instead of surface.
this picture is before surround with “RCC”
Thank you in advance,
thanapong