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Forum: Processes Involving Optical Photons
Re: None photoelctrons ??? (Davinder Siwal)
Re: Disagree Re: photoelctrons ??? (Gumplinger Peter)
Re: None Re: photoelctrons ??? (Davinder Siwal)
Date: 19 Jan, 2011
From: Gumplinger Peter <Gumplinger Peter>

> 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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1 None: Re: photoelctrons ???   (Davinder Siwal - 19 Jan, 2011)
(_ Feedback: Re: photoelctrons ???   (Gumplinger Peter - 20 Jan, 2011)
(_ None: Re: photoelctrons ???   (Davinder Siwal - 20 Jan, 2011)
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