Dear David, [image] Questions about source_newgen.f Advanced Features and User Routines Dear @Mihaela_Parvu , In view of this discussion , I got some doubts regarding the source_newgen.f that has been shared here. I am sharing here one journal that I found on this topic wh…

Dear @mayank.rse , Your neutron spectrum file has only two columns and you are using histogram sampling in your source. ! Histogram file has to have 3 columns: ! - Emin (of the bin) ! - Emax (of the bin) ! - dN/dE (bin height; NOTE: doesn't need to be normalized) I sug…

Dear Mihaela, Thank you so much for your kind reply and identifying my goof up. I was able to run the file. However the results from USRTRACK does not match the spectrum definition in the text file(kindly see the attached image). The spectrum definition in the text file is of the order of 1e14, whi…

Dear Mayank, the FLUKA results are normalized to one primary particle. If your input spectrum assumes an actual neutron rate, then you you need to manually multiply the FLUKA results with it. Your sampling algorithm looks fine. To check it you can use the debug function of the source_newgen user r…

Thank you David for the clarity. I was able to run the source file cleanly and score neutron fluence in cylindrical binning using USRBIN. Thank you so much. Best Mayank

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Cylindrical neutron source sampling

Source Definition

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