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Question Question about dielectric_LUT type optical surface 

Forum: Processes Involving Optical Photons
Date: 12 Mar, 2013
From: Young <Young>

Hello all,

I have been running a simulation of photons generated within a scintillator crystal wrapped in Tyvek. I have been noticing that when I define a logical skin surface (as shown below) for the logical volume of the scintillator, there are still photons that escape the scintillator volume.

	G4LogicalSkinSurface* ScintSurface =
		new G4LogicalSkinSurface("ScintSurface",
		logicScintillator,
		ScintTyvekOpSurface);

	ScintTyvekOpSurface->SetType(dielectric_LUT);
	ScintTyvekOpSurface->SetModel(LUT);
	ScintTyvekOpSurface->SetFinish(polishedtyvekair);

I am puzzled by this, as the reference linked in the relevant section in "Application Developers", (http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5485130&isnumber=5485053) seems to suggest that only reflection or absorption happens for these dielectric_LUT optical surface types. From a quick look at the source code for G4OpBoundaryProcess, this seems to be true (http://www-geant4.kek.jp/lxr/source/processes/optical/src/G4OpBoundaryProcess.cc#L751). Yet the photons in my simulation still go through this surface that is supposed to only absorb or reflect photons.

Does anyone know why this is happening? Please let me know if there is more information I can provide.

Thanks very much,

Young Ho Shin

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1 Feedback: Re: Question about dielectric_LUT type optical surface   (Gumplinger Peter - 15 Mar, 2013)
(_ None: Re: Question about dielectric_LUT type optical surface   (Young - 25 Mar, 2013)
(_ Feedback: Re: Question about dielectric_LUT type optical surface   (Gumplinger Peter - 25 Mar, 2013)
(_ None: Re: Question about dielectric_LUT type optical surface   (Young - 26 Mar, 2013)
(_ None: Re: Question about dielectric_LUT type optical surface   (Erik Dietz-Laursonn - 16 Apr, 2013)
(_ None: Re: Question about dielectric_LUT type optical surface   (Nick Calvert - 02 May, 2013)
(_ More: Re: Question about dielectric_LUT type optical surface   (Zach Hartwig - 09 May, 2013)
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