|Message: Re: physics list model for scintillation of NaI(Tl)||Not Logged In (login)|
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> Dear Sir, We tried adding G4OpticalPhysics to TestEm1. It gives a almost > good histogram, for number of optical photons but the Compton region is > very less in width. > > Attachment: > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2012/06/21/13.05-93418-NoOfOpPhotons.pdf > > Then we tried plotting the optical photon energies.
The optical photon energy spectrum is simply the scintillation spectrum. It is not correlated with the spectrum you hope to see, which is the energy deposited in your NaI crystal. Only the number of optical scintillation photons produced is proportional to the energy deposition in the crystal.
> Is there any particular parameter or value or range that can increase > the height of the Compton region ?
I suggest you also plot the energy deposition in the crystal. This plot should look exactly like the plot of number of scintillation photons produced where one has as the x-axis energy and the other has # of photons. If so, and you find the Compton region is still underrepresented then you'll need to post in the ElecromagneticPhysics Forum. You could also investigate how often Compton scattering happens vs the photo electric effect, and other parameters of the electromagnetic shower you get from gamma interactions - energy leakage etc.
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