USRBIN vs USRTRACK fluence discrepancy

Scoring
1

Versions

Please provide the used software versions.

FLUKA: 4-5.1
Flair: 3.4-3

Description

Dear Experts,

I have scored Fluence inside a region using USRBIN and USRTRACK. Now the sum.lis output of USRTRACK should be comparable to the total fluence calculated using USRBIN. But, I am getting different values.
Can you please explain the reason behind this.

Thanking you in advance.

45MeV_Li6_ion_beam.flair (4.4 KB)

45MeV_Li6_ion_beam.inp (1.8 KB)

Input files

Please upload all relevant files. (FLUKA input file, Flair project file, user routines, and data files)

2

The reason is that in USRTRACK you set an energy cut of 8 MeV, while your beam has a kinetic energy of 45 MeV. In USRTRACK the kinetic energy is not intended per nucleon (or more precisely per nuclear mass unit), as is in the BEAM card for HEAVYION.
As a side note, I’d not say total fluence, rather average fluence, since fluence - being an intensive quantity - is not additive over a volume.

3

Thank you for your reply. Now I put Emax = 0.045 GeV in USRTRACK and the result is matching.

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