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Forum: Processes Involving Optical Photons
Re: Question One more question on the UNIFIED model (Clarisse)
Date: 12 Mar, 2009
From: Gumplinger Peter <Gumplinger Peter>

Dear Clarisse,

Imagine a photon sensitive surface (photo cathode) which can reflect or absorb an incoming photon. If that photon is reflected, it can obviously not have been detected. If it is absorbed (governed by the reflectivity) it may still not be 'detected' due to quantum efficiency issues. This final argument can be considered as something the G4 user should take care of in his/her hit collection/scoring. In this case, though, G4 already provides the ability to allow for a wave length dependend detection efficiency. The return status:

boundaryStatus=boundary->GetStatus();

of the G4OpBoundaryProcess (boundary) will return "Detection" instead of "Absorption" depending on how the random number falls when compared with the 'Efficiency'. Please, see the example:

http://www-geant4.kek.jp/lxr/source/examples/extended/optical/LXe/src/LXeSteppingAction.cc

on how to get a pointer to the G4OpBoundaryProcess.

If you are concerned with an inert surface, you do not have to define an 'Efficiency'. The default is 0.

Peter

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