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None Re: Question about the linearity parameter in LYSO crystal 

Forum: Processes Involving Optical Photons
Re: None Question about the linearity parameter in LYSO crystal (Davinder Siwal)
Re: Feedback Re: Question about the linearity parameter in LYSO crystal (Gumplinger Peter)
Date: 24 Nov, 2011
From: Davinder Siwal <Davinder Siwal>

Thanks Peter for replying my question

Initially I tried to change the reflection coefficient of the crystal surface in a following manner

 G4OpticalSurface* DetOptSurface = new G4OpticalSurface("DetectorSurface");

  G4double Reflectivity[nEntries]    =  {0.95, 0.95, 0.95};
  G4double Efficiency[nEntries]     = {0.0, 0.0, 0.0};

  G4MaterialPropertiesTable* myST1 = new G4MaterialPropertiesTable();

  myST1->AddProperty("REFLECTIVITY", PhotonEnergy, Reflectivity,   nEntries);
  myST1->AddProperty("EFFICIENCY",   PhotonEnergy, Efficiency,     nEntries);

  DetOptSurface->SetMaterialPropertiesTable(myST1);

 DetOptSurface->SetType(dielectric_metal);
 DetOptSurface->SetFinish(polished);
 DetOptSurface->SetModel(unified);

 new G4LogicalBorderSurface("Surface",crystal_phys,housing_phys,DetOptSurface);

I tried to change the reflection coefficient also But I came to know that it does not help for reproducing the experimental results an then yesterday I tried by wrapping the crystal with Aluminum foil reflector in a lateral direction of LYSO crystal in the following way

G4OpticalSurface* DetOptSurface = new G4OpticalSurface("DetectorSurface");

  G4double Reflectivity[nEntries]    =  {0.95, 0.95, 0.95};
  G4double Efficiency[nEntries]     = {0.0, 0.0, 0.0};

  G4MaterialPropertiesTable* myST1 = new G4MaterialPropertiesTable();

  myST1->AddProperty("REFLECTIVITY", PhotonEnergy, Reflectivity,   nEntries);
  myST1->AddProperty("EFFICIENCY",   PhotonEnergy, Efficiency,     nEntries);

  DetOptSurface->SetMaterialPropertiesTable(myST1);

 DetOptSurface->SetType(dielectric_metal);
 DetOptSurface->SetFinish(polished);
 DetOptSurface->SetModel(unified);

 new G4LogicalBorderSurface("Surface",foil_phys,housing_phys,DetOptSurface);

But that does not help actually. In their work they wrap the scintillator with a black tape and front surface is covered with ESR reflector. Can you suggest me what changes do I need to do in the code .

With Regards Davinder

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