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Forum: Physics List
Re: Question Backscattering Validation (A. Hod)
Date: 31 Oct, 2014
From: michel maire <michel maire>

On Fri, 31 Oct 2014 09:06:46 GMT, A. Hod wrote:
> Dear all,
> 
> I calculated the coefficient of backscattered electrons from silicon,
> carbon, aluminum and gold layers of 200 um thickness with Geant4. The
> calculated backscattered coefficients are:
> 
> Backscattering coefficient n= number of scattered primary
> electrons/number of incident electrons.
> 
> Carbon (Z=6): n= 10.81%
> 
> Aluminium(Z=13): n=19.09%
> 
> Silicon(Z=14): n=21.30%
> 
> Gadolinium (Z=64): n=46.02%
> 
> Gold (Z=79)= n=49.11%
> 
> Additional information:
> 
> Physics model: low energy EM physics (Livermore model)
> 
> Layers: 1mm x 1mm x 0.2 mm
> 
> Cut= 1 um
> 
> Energy of normally incident electrons: Ee=300 keV
> 
> I would like to validate my calculation. Could you please suggest some
> references concerning the calculation of the backscattered electron
> coefficient? Thanks in advance and I kindly welcome your cooperation.

  In example TestEm5 you will find a file references.txt
  However, this file has not been updated since a long time.

  ps. I ran TesEm5 with the attached macro. I got results somewhat different of you :
       Carbon ~ 3.4%   Aluminium ~ 12.2%   Silicon ~13.4%   Gadolinium ~ 43%   Gold ~ 48%

        Michel

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/10/31/07.28-63451-hode.mac.txt
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/10/31/07.28-90020-Aluminium.out.txt

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