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Forum: Processes Involving Optical Photons
Re: Question Optical photons and energy conservation (Steve Asztalos)
Date: 13 Nov, 2014
From: Gumplinger Peter <Gumplinger Peter>

> In a latter design I replaced the embedded sphere with a thin tube of
> BC404 placed at the end of the CsI tube. The source is now external and,
> at sufficiently high energies, deposits energy in both scintillators.
> The problem is that now a) the sum of the electron energy deposited in
> the BC404+CsI exceeds the beam energy, and I have found that this
> discrepancy grows as I manually increase the light yield.

The scintillation process and the other processes leading to an energy loss have nothing in common (except that the scintillation process uses the energy lost to calculate the number of photons). I have no explanation why the light yield can affect the energy depostion - if you don't count the optical photons' energy.

> I read the manual on optical processes and am not counting the optical
> photon energies (though the fact the amount that total deposited energy
> exceeds the beam energy depends on the value I choose for the light
> yield bothers me).

Yes, something is strange ....

> Do I need to explicitly specify the boundary between
> the two dielectrics (the manual seems to indicate no - in that case it
> is only a matter of the different indices of refraction).


Perhaps something is wrong in your PhysicsList or how you tally the energy loss.

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