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None a problem about the LUT model of optical surface 

Forum: Processes Involving Optical Photons
Date: 22 Dec, 2010
From: <tanghh@ihep.ac.cn>

Hello,
   I simulated the scintillating photons from a box scintillator wrapped 
by ESR film, and the optical surface is defined by LUT model as following:

    G4OpticalSurface* OpLYSOSurface = new G4OpticalSurface("LYSOSurface");
    OpLYSOSurface->SetType(dielectric_LUT);
    OpLYSOSurface->SetFinish(polishedvm2000air);
    OpLYSOSurface->SetModel(LUT);
    G4LogicalBorderSurface* LYSOSurface = 
                                 new G4LogicalBorderSurface("LYSOSurface",
                                 LYSO_phys,expHall_phys,OpLYSOSurface);
    G4double AirRindex[nEntries] = {1.0, 1.0, 1.0};
    G4double ESRreflec[nEntries] = {0.98, 0.98, 0.98};
    G4MaterialPropertiesTable* myST1 = new G4MaterialPropertiesTable();
    myST1->AddProperty("RINDEX", LYSO_Energy, AirRindex, nEntries);
    myST1->AddProperty("REFLECTIVITY", LYSO_Energy, ESRreflec, nEntries);
    OpLYSOSurface->SetMaterialPropertiesTable(myST1);

   But, I find a strange place about this model. The photon seems to have 
a little probability to pass through the reflecting wrap. As I know, 
a random piece of solid angle (denoted by  and phi)is looked up for 
the direction of the reflected photon, and -90deg<<90deg, so the 
reflected photon could not pass through the wrap to the outside world.
How does this happen?
   Thanks

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1 Feedback: Re: a problem about the LUT model of optical surface   (Gumplinger Peter - 17 Jan, 2011)
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