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

From: Roxana-georgiana Rata U1179323 <Roxana.Rata_at_hud.ac.uk>
Date: Wed, 3 Dec 2014 13:27:52 +0000

Dear Nikhil,

A colleague from CERN , did the simulations 2 years ago, using FLUKA. I don't have her input. I've emailed her, but she didn't replied. All I have is this slide, which I attached for you. Maybe from the results, you can figure something.
Thank you!

Regards,

Roxana
________________________________
From: nikhil shetty [nikhil.nitk_at_gmail.com]
Sent: Wednesday, December 03, 2014 10:21 AM
To: Roxana-georgiana Rata U1179323
Subject: Re: [fluka-discuss]: heavy ion dose scoring

Hi Roxana,

could you send the other input file that worked? I can try to compare. Anyhow, note that the usual method of dose scoring doesn't work for heavy ions.

Cheers,
-Nikhil

On Mon, Dec 1, 2014 at 3:44 PM, Roxana-georgiana Rata U1179323 <Roxana.Rata_at_hud.ac.uk<mailto:Roxana.Rata_at_hud.ac.uk>> wrote:
Dear Nikhil,

Thank you for your advices. The size of the bin shouldn't represent a problem in this case, because the other simulations, with the same bin size, gave good results, but not this time, so definitely, is something wrong with my input. But I don't know what. I am not an experienced user, so I need some help.

Thank you!

Regards,

Roxana
________________________________
From: nikhil shetty [nikhil.nitk_at_gmail.com<mailto:nikhil.nitk_at_gmail.com>]
Sent: Friday, November 28, 2014 4:32 PM
To: Roxana-georgiana Rata U1179323
Cc: fluka-discuss_at_fluka.org<mailto:fluka-discuss_at_fluka.org>
Subject: Re: [fluka-discuss]: heavy ion dose scoring

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<mailto: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
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Received on Wed Dec 03 2014 - 16:46:20 CET

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