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Feedback Re: nonproportionality of scintillation light yield 

Forum: Processes Involving Optical Photons
Re: Question nonproportionality of scintillation light yield (Martin Goettlich)
Re: Feedback Re: nonproportionality of scintillation light yield (Gumplinger Peter)
Re: None Re: nonproportionality of scintillation light yield (Martin Goettlich)
Date: 08 Jun, 2011
From: Gumplinger Peter <Gumplinger Peter>

Good question Martin,

I must admit, the documentation for this new option is still a bit cryptic in our Application Developers Manual. You need to give the absolute yield, e.g. the number of scintillation photons produced at a given energy deposit.

Please, see the code inside G4Scintillation.cc:

        if (scintillationByParticleType) {
....
           if(pDef==G4Proton::ProtonDefinition())
             Scint_Yield_Vector = aMaterialPropertiesTable->
               GetProperty("PROTONSCINTILLATIONYIELD");
....
           // Obtain the scintillation yield using the total energy
           // deposited by the particle in this step.

           // Units: [# scintillation photons]
           ScintillationYield = Scint_Yield_Vector->
                                            GetProperty(TotalEnergyDeposit);
        } else {
           // The default linear scintillation process
           ScintillationYield = aMaterialPropertiesTable->
                                      GetConstProperty("SCINTILLATIONYIELD");

           // Units: [# scintillation photons / MeV]
           ScintillationYield *= YieldFactor;
        }
....
        if (scintillationByParticleType)
           MeanNumberOfPhotons = ScintillationYield;
        else if (emSaturation)
           MeanNumberOfPhotons = ScintillationYield*
                              (emSaturation->VisibleEnergyDeposition(&aStep));
        else
           MeanNumberOfPhotons = ScintillationYield*TotalEnergyDeposit;

Cheers, Peter

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