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Forum: Processes Involving Optical Photons
Re: Question test out of a gamma detector (Iryna Chaikovska)
Date: 14 Oct, 2010
From: Gumplinger Peter <Gumplinger Peter>

Hi Iryna,

Sorry, your posting slipped 'under the radar'.

I don't know of a "standard test". As for your question about the rise time in G4Scintillation (G4.9.4beta), there has just been a new posting asking what should be the correct definition:

http://hypernews.slac.stanford.edu/HyperNews/geant4/get/opticalphotons/297/1/1/1/1.html

The intention is certainly that it describes a property of the scintillator material but you are right that the measured rise time is a combination of material and electronics response and TOF. The electronic delay of the PMT you must add on top. However, that seems not very practical to me, when both could just be lumped (two exponentials) into one constant attributed to the material. This then is convoluted by the time of flight of the photons to give you the final arrival time distribution and hence the pulse shape.

Peter

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