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All looks good!
> One last question: what interface and what process does efficiency refer to?
Efficiency is a concept related to 'Detection'. A surface may be considered to be an optical photon detector (for example, a photocathode). Not all absorbed photons will actually be detected; there is a finite efficiency. You can specify that efficiency as a function of wavelength/energy, so once a photon is absorbed (and not reflected), G4OpBoundaryProcess throws a second random number, to tag this photon as 'Detection'. Your Tyvek is not a detector and so you don't need to specify "EFFICIENCY" (it is zero by default). Hence, all the photons that are absorbed at your 'backpaint' will be flagged by 'Absorption'.
On Fri, 30 Aug 2013 19:32:51 GMT, Guillaume wrote:
> Hello, > > Thank you very much for your illuminating response. I have attached a > diagram that attempts to describe my understanding of your post. Please > let me know what if anything is wrong about it. One last question: what > interface and what process does efficiency refer to? > > Thanks again, Guillaume > > Attachment: > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2013/08/30/12.29-85821-diagram.JPG >