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Forum: Processes Involving Optical Photons
Re: Question optical photon self-absorption in scintillator (Benton Pahlka)
Re: Question Re: optical photon self-absorption in scintillator (Eric)
Date: 16 May, 2011
From: Benton Pahlka <Benton Pahlka>

Hi,

You should be able to do this if you define your WLS absorption spectrum in the 2.5 - 3.5 eV range to be very high, say 100 meters or more.

In general, I try to have all my spectra span the same wavelength set, even if some values are zero or very large.

Benton

On Mon, 16 May 2011 20:10:21 GMT, Eric wrote:

> Hello-
> 
> I am trying to simulate a situation where the a scintillator can have a
> WLS, but only for a portion of the scintillator's emission spectrum, and
> when it is re-emitted it will likely be out of the absorption range, and
> therefore only absorbed once.
> 
> What I'm experiencing is that since my initial emission, WLS absorption,
> and WLS emission spectra don't all match up, Geant will take a photon
> that is created out of the WLS absorption range, and just use the lowest
> value for that spectrum, absorbing it again.
> 
> For example:
> 
> Intial Emission Spectrum: 2.5 - 4.5 WLS Absorption Spectrum: 3.5 - 4.5
> WLS Emission Spectrum: 2.5 - 3.5
> 
> In this situation, I would like any photon initially created with an
> energy of 3.5 - 4.5 to be absorbed and re-emitted with a new energy of
> 2.5 - 3.5, never to be reabsorbed again, but Geant seems to over ride
> this and treat it as a 3.5 eV photon anyway, despite being out of range.
> 
> Is there a mechanism is Geant to do this?
> 

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