Re: [fluka-discuss]: energy deposition for 3MeV protons

From: Francesco Cerutti <Francesco.Cerutti_at_cern.ch>
Date: Tue, 29 Jul 2014 14:46:20 +0200

Hi Tristan,

default settings mean 10 MeV transport threshold for hadrons (but
neutrons) and muons, which is obviously inadequate for a 3 MeV proton
beam. Being below threshold, the latter will just do a single step up to
the end of its range, hence the flat energy deposition profile. Take
PRECISIO DEFAULTS (implying 100 keV transport threshold) and you will see
the expected Bragg peak.
Note that in your case neutrons (if any) do not play any role wrt the
depth-dose profile.

Cheers

Francesco

**************************************************
Francesco Cerutti
CERN-EN/STI
CH-1211 Geneva 23
Switzerland
tel. ++41 22 7678962
fax ++41 22 7668854

On Tue, 29 Jul 2014, tristan.davenne_at_stfc.ac.uk wrote:

>
>  
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> Hi, I am trying to calculate the energy deposition of 3MeV protons impinging on various
> metals, the energy is deposited within a depth of a fraction of a mm depending on the
> metal. I am using FLUKA with the default settings so low energy neutron library
> activated.
>
>  
>
> I find the energy deposition as a function of depth looks quite flat without the
> significant bragg peak that was expected. Can someone explain why I am not seeing a sharp
> bragg peak at this energy?
>
>  
>
> Many Thanks
>
>  
>
> Tristan
>
>  
>
>
> --
> Scanned by iCritical.
>
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>
Received on Tue Jul 29 2014 - 16:18:13 CEST