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Hi Peter Thanks for info that's exactly what I wanted to know and the szintillation process does exactly what I want. Glad that I asked . cheers Hans Gumplinger Peter wrote: > *** Discussion title: Processes Involving Optical Photons > > Dear Hans, > > Birks Correction is implemented in G4Scintillation.cc since G4.9.2. > Before then it existed as G4BirkScintillation class. See for example > /examples/extended/optical/LXe how to specify the Birks constant. (The > TestEm3 code predates the time since this is available through the > process itself); see: > > http://www-geant4.kek.jp/lxr/source/processes/electromagnetic/xrays/src/G4Scintillation.cc#L193 > > and: > > http://www-geant4.kek.jp/lxr/source/processes/electromagnetic/utils/src/G4EmSaturation.cc#L77 > > Hope this adequately satisfies your requirement, Peter > > ------------------------------------------------------------- > Visit this GEANT4 at hypernews.slac.stanford.edu message (to reply or unsubscribe) at: > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/opticalphotons/311/1.html >