[Gate-users] Dielectric_metal surface for optical photons detection

[open researcher]

I have few doubts regarding Dielectric_metal surfaces for optical photon
detection.

1. Consider photons are moving from a crystal to PMT, and there is a
Dielectric_metal surface between them. My doubt is, will the R.I of PMT
matters or only the efficiency, reflectivity of the surface matters ?

2. Let the crystal and PMT be daughter volumes of SPECThead system. I have
defined a Dielectric_metal surface between *PMT and crystal* and ran a
macro, I got photons detected by the Dielectric_metal surface at the PMT
and crystal junction ( -1.709e+02 in mm ). Next time I defined a
Dielectric_metal surface between* PMT and SPECThead*, even then I got
photons detected by the surface at PMT and crystal junction ( -1.709e+02 in
mm ). Is this expected ?

                   PMTs
           _______________________________________ _____  y = -17.09 cm
           |
                          |
           |         NaI crystal                                          |
           |______________________________________|

|                                                                  |
           |               collimator                                     |
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