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

From: Ahmed Mogames <ahmedmogames_at_gmail.com>
Date: Mon, 1 Dec 2014 23:57:10 +0200

I will use monte carlo simulator (Fluka) for positron emission tomography
to simulate scattering, but I don’t have idea or proposal.

I am try to find new proposal for scatter correction in 3D positron
emission tomography.

*Where I get new proposal (new idea) for scatter correction in 3D PET for
do it ?*

*Thank you*

2014-11-28 18:32 GMT+02:00 nikhil shetty <nikhil.nitk_at_gmail.com>:

> 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 Tue Dec 02 2014 - 00:31:11 CET