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Re: Question Energy range question (andreas battaglia)
Date: 02 Dec, 2005
From: Gumplinger Peter <Gumplinger Peter>

Hello Andreas,

>  G4double PhotonEnergyScint[nEntriesScint] =
>    {  
>      3.44*eV, 3.26*eV, 3.1*eV, 3.02*eV, 2.95*eV, 2.92*eV, 
>      2.82*eV, 2.76*eV, 2.7*eV, 2.58*eV, 2.38*eV, 2.08*eV       
>    };

I am pretty sure the code is indifferent about increasing or decreasing values of 'photon energy'. However, I have never tested it reversed, so to be absolutely safe, I suggest you order the vector with increasing energy.

You will not get any scintillation photons outside the range you specify. Within the range, the spectrum will be sampled by the relative probabilities you specified.

>  G4double ScintilFast[nEntriesScint] =
>    {    
>      0.04, 0.07, 0.20, 0.49, 0.84, 1.00, 
>      0.83, 0.55, 0.40, 0.17, 0.03, 0.00 
>    };

In your case, the spectrum will go to zero at 2.08eV but will have a finite probability at 3.44eV.

> - for Energy = 3.44*eV ---> Scintillation probability = 0.04
>   for Energy = 2.08*eV ---> Scintillation probability = 0.00
>   for Energy > 3.44*eV && for Energy < 2.08*eV ---> Scintillation probability not defined

> The scintillation is not activated at all or what?

I think you are confused....optical photons don't generate scintillation photons. Deposited energy generates scintillation photons, the spectrum of which is generated inside the range where you specified scintillation probabilities.

> And are the extreme points interpreted in the same way by all the physical modules or not?:

Yes, the code that's being used is in the materials category:

http://www-geant4.kek.jp/lxr/source/materials/src/G4MaterialPropertyVector.cc

specifically the method:

G4double 
  G4MaterialPropertyVector::GetProperty(G4double aPhotonMomentum) const

Hope this clarifies things, Peter

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