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Forum: Processes Involving Optical Photons
Date: 03 Jul, 2006
From: Vladimir IVANTCHENKO <vnivanch@mail.cern.ch>

On Fri, 30 Jun 2006, Peter Gumplinger wrote:

> *** Discussion title: Electromagnetic Processes
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/emprocess/509/1"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> The optical reflectivity of the scintillator surface is the probability
> of reflection (as opposed to absorption) at each and every bounce; i.e.
> encounter with the surface. The optical reflectivity is a material
> (surface) property which you need to know through other means.
> 
> Conversely, if you know the light yield, and for your geometry and PMT
> photo efficiency, the number of photo electrons at the PMT for 662keV
> gammas, you can tune the MC optical surface reflectivity until the MC
> gives you the same result.
> 
> Of course, with 100% reflectivity all produced photons (assuming you
> have no bulk absorption) will eventually arrive at your PMT no matter
> how many bounces.
> 

Hello,

I would suggest to set reflectivity to 100% and study the dendence of 
results on cut and/or other parameters. After optimization return to 
detailed simulation of optical photons.

VI

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