Re: [fluka-discuss]: Discrepancy between FLUKA and ICRU 49/NIST in He stopping powers for alphas

From: Santana, Mario <msantana_at_slac.stanford.edu>
Date: Mon, 14 Jul 2014 17:36:55 -0700

Luke,

Are you using 5 MeV momentum or energy for your initial beam?
What are your transport thresholds and DEFAULT cards? What is the density
of the helium medium?
Are you comparing to the stopping power in dE/dx or (dP/dX = FLUKA output)?

Could you send your input file?

Mario

On 7/14/14 7:06 AM, "Luke Bird" <luke.bird_at_oncology.ox.ac.uk> wrote:

>Dear FLUKA experts and users,
>
>When simulating alphas moving through helium in SRIM and FLUKA I found
>that FLUKA tallied higher energies than SRIM, so I investigated and
>found that FLUKA outputs lower stopping powers for helium (Using SDUM =
>PRINT in the deltaray card) and those given in
> the TRIM/NIST databases as well as those in ICRU 49 (See figure
>attached).
>
>Is this a known issue or am I going wrong somewhere - although I don't
>see where. I am just initialising alphas with ~0.005 GeV and printing
>the stopping power to the output with he DELTARAY card.
>
>Thanks,
>
>Luke
Received on Tue Jul 15 2014 - 03:53:25 CEST