Re: [fluka-discuss]: heavy ion dose scoring

From: nikhil shetty <nikhil.nitk_at_gmail.com>
Date: Fri, 28 Nov 2014 17:32:57 +0100

Dear Roxana,

have a look at notes 4 and 5 for the AUXSCORE entry in the manual:

" 4) Dose conversion coefficients exist only for some particle types:
            hadrons, muons, photons, electrons/positrons. For all other
            particle types, zero factor will be returned. This is
particularly
            important for heavy ions where zero factor will be scored (see
            Note 5)

         5) For particles such as heavy ions, for which fluence conversion
            factors are not available, it is possible to score with USRBIN
the
            generalised particle DOSEQLET, i.e. dose equivalent as defined
by
            ICRU: H = D x Q(L), where L is the unrestricted Linear Energy
            Transfer in water.
"

Perhaps this addresses your issue.

Also, it seems you want to score the dose in the concrete region of your
geometry. If this is the case, I guess that after looking at the geometry
and meshes, the bin size of the meshes may be too large because of which a
high dose could be smeared out. Try to reduce the bin size of the meshes
and localize the mesh to the region of interest or to the region for which
you have the expectation from theory.

Cheers,
-Nikhil



On Fri, Nov 28, 2014 at 12:08 PM, Roxana-georgiana Rata U1179323 <
Roxana.Rata_at_hud.ac.uk> wrote:

>
> Dear FLUKA experts,
>
> I have to simulate a 250 MeV carbon beam hitting a stainless steel pipe
> and to measure the neutron dose equivalent.
> I created my input, my simulation is running perfectly but it seems that
> the neutron dose is to low. In theory I should obtain 29 uSv/h for 1% beam
> loss (2.5x10^7 ions/s)
> Could you, please, check my input and tell me what I'm doing wrong?
>
> Thank you!
>
> Regards,
>
> Roxana
> University of Huddersfield inspiring tomorrow's professionals.
>
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Received on Fri Nov 28 2014 - 19:01:03 CET

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