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Forum: Documentation and Examples
Re: Question NIEL energy deposit (Cristina Consolandi)
Date: 26 Mar, 2008
From: Vladimir IVANTCHENKO <>

On Wed, 26 Mar 2008, Cristina Consolandi wrote:

> *** Discussion title: Documentation and Examples
> Email replies to must include:
>   In-Reply-To: <"/docsexamples/411">
>   Subject: ...change this to be about your reply.
> Good morning, I'm running the example TestEm7 using standardNR. When I
> make my run with the following parameters
>   RecoilCutoff= 21 eV
>   PhysiscsCutoff=10 eV
> I obtain these results:
>   The run consists of 1000 Si28[0.0] of 1 GeV through 100 um  of G4_Si (density: 2.33 g/cm3 )
>   Projected Range= 100 um    rms= 10612.3 fm
>   Mean number of primary steps = 104.276
>   Total energy deposit= 58.1102 MeV
>   NIEL energy deposit = 21.4236 keV
> I already contacted Mendenhall who explained to me that in the present
> version of G4ScreenedNuclearRecoil it is not possible to get NIEL energy
> deposit, so may you tell me what is the " NIEL energy deposit " that I
> obtain and how is it calculated? Thank you very much. Cri


NIEL computation were delivered for the first time with the G4 release
9.1, however there were some problems, for example, numbers which you show
are too big. In a good part these problem have been fixed for the February
reference tag of G4: geant4-V09-01-ref-02, this version of Geant4 is
available at CERN afs. Please, try to use it, you can apply standard
Physics Lists and have reasonable results. For comparison it is possible
to use NR physics list if initialial proton energy below 100 MeV. I would
not play with its parameters without approval of authors. I would
recommend to compare results with ICRU'49 evaluated data and SRIM'06

Please, use emprocess forum for communication.


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