|Message: Re: photoelctrons ???||Not Logged In (login)|
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> if we don't get any photoelectrons then we should define only a piece of
> material(PMT) at the back side of scintillator and just look at the photon
> striking position on this material
The reason the LXe example defines both a PMT and a photo-cathode is that the photo-cathode is at the back of a glass window. The glass-window (e.g. the PMT) is butt against the scintillator. Photons may now reflect off the scintillator/glass interface and never strike the photo-cathode. This is a small refinement/improvement over simply counting photons that hit the PMT glass.
The 'PMT photo-efficiency' is usually the bare efficiency of the photo-cathode metal when a photon has actually struck.
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