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Forum: Documentation and Examples
Re: Question electron range in TestEm18 (Yannick Arnoud)
Date: 06 May, 2009
From: michel maire <michel maire>

On Tue, 05 May 2009 17:16:35 GMT, Yannick Arnoud wrote:
>    Attachment:
>       http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2009/05/05/09.55-22633-dumpTexte.gif
>       http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2009/05/05/09.55-46331-dumpEcran.gif
>       http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2009/05/05/09.59-35030-electron.gif
> 
> Dear Geant 4 experts,
> 
> We are testing the energy loss of electrons in water. We used the
> TestEm18 example and obtained a very weird result for "low" energy
> electrons. All the 1 keV electrons we generate experience one
> interaction after 63.1 microns, and lose all their energy. The stepcut
> we use is 1 nm, far smaller than this 63 microns length.
> 
> Is our set of parameters wrong ? (see attached electron.mac) Do you have
> any piece of advice ?
> 

 Most likely you have already realized that the range is 63 nanometers (not microns), which is of the order of what we expect from de/dx, ~120 MeV/cm according NIST.

 Please, see also TestEm0.

       Michel

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