Dear Shubham,
thank you for your questions.
Please refer to Lecture Scoring 1 - “Volume normalisation” page 16 for your first inquiry.
- USRBIN per region: FLUKA results are not normalised by volume.
- USRBIN meshes: FLUKA results are normalised by volume.
This because FLUKA does not calculate regions volumes (which can be arbitrarily complex), while the volume computation of the available scoring meshes is trivial.
I am glad that your second inquiry is already solved. This forum post can also give you some hints about how to exploit the “Step1” field in your USRBIN cards with region type scoring.
I hope this helps.
Best regards,
Tommaso