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Forum: Processes Involving Optical Photons
Re: None Birks attenuation (Hans Wenzel)
Re: Question Birks attenuation (Hani Negm)
Re: None Re: Birks attenuation (Hans Wenzel)
Date: 11 Jan, 2014
From: michel maire <michel maire>

On Wed, 25 Dec 2013 14:53:25 GMT, Hans Wenzel wrote:
> Dear Hani
> 
> Geant 4 can't help you getting the Birks constant. For Geant 4 the 
> constant is a input value that you have to provide and
> which comes from an experimental measurement (literature). Once you have 
> provide the value you can calculate the reduced using the code snippet 
> below
> that I took from Andrea Dotti. I have also attached a root macro that 
> shows the suppression curve for a few materials that I found in the 
> literature.
> 

  You can find another simple example of this in TestEm3 (in extended/electromagnetic):
 - Birks constant C1 is put in material data in DetectorConstruction.cc (around line 173)
 - Birks correction is done in SteppingAction.cc

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