Re: eV energy process

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On Tue, 25 Aug 2009 12:24:13 GMT, Luciano Pandola wrote:

> Hello,
> 
> > In my simulation, I need to count the secondary electron number produced
> > by 2.3keV X-ray in CsI(100nm). During interaction, the elctron energy
> > will be at several eV less than 250eV. 
> > Is the reason that I can not get all the number of secondary electron by
> > using Livermore or standard process?
> 
> Geant4 has a production threshold. It means that delta-rays below 250 eV
> are NOT produced explicitely in any of the Em processes (including
> Livermore and Penelope). Energy deposits below 250 eV are treated as
> local energy deposit.
> 
> > then where I can get the correct physics process for less than 250eV to
> > get correct secondary electron number?
> 
> at the moment there are not in Geant4 electron processes validated below
> 250 eV in CsI. The very low energy models (Geant4-DNA) apply to liquid
> water only.
> 
> Hope it helps. ciao, Luciano
>

Thanks.

From the paper, for 2.3keV gamma ray, SE yield will be almost 1 per incident photon, when CsI thickness between 100 and 300 nm; but Geant4 program only get 0.1 SE yield per photon for the same condition. Is it the reason that below 250eV delta-ray not produced in the Geant4?