|Message: Re: NaI scintillator - Al housing reflectivity - too many reflections||Not Logged In (login)|
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Perfect reflectivity is not realistic even for a very well packed crystal. I can't say what the actual value should be but a literature search may yield some guidance (I assume your reflector is TiO2).
Moreover, even the best NaI crystals are usually not very clear and hence have a very much finite bulk absorption length for their own scintillation photons.
Both these physical effects should limit the track length of optical photons. But yes, tracking optical photons is time consuming due to the many possible bounces.