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Forum: Processes Involving Optical Photons
Re: None Scintillation Process Question
Date: 19 Apr, 2009
From: Benton Pahlka <Benton Pahlka>

Hi,

From what I understand, G4 does not model the electron-hole production process, but rather models the description macroscopically by Bethe Bloch energy deposition and subsequent light emission via G4Scintillation. For inorganic scintillators, your main quantities of interest for G4 implementation are the light yield, (~50-60k photons/MeV), the emission spectrum of the light, the absorption length of your particular scintillator and the scintillator time decay constant.

Ultimately the light yield for your particular NaI(Tl) depends on the dopant concentration, but this must be measured, and will affect the absorption properties as well.

The absorption and emission are wavelength dependent properties that you can find (e.g. in Knoll, Radiation Detection and Measurement or in publications), and then use as inputs to your program. Example N06 can get you started. ExN06DetectorConstruction.cc describes how to implement these quantities.

Cheers,

Benton

>*** Discussion title: Processes Involving Optical Photons

>Hello, I have a question concerning how scintillation is handled in
>Geant.

>If you have a NaI(Tl) crystal, for example, valence electrons promoted
>to the conduction band will by far be from the Iodine and Sodium atoms.
>Some of these occur near a Thallium dopant and these excitons "drift"
>toward the thallium atom and the electron hole pair will be transferred
>to the Thallium atom which will then de-excite and produce light. My
>question is, how is this process modeled in Geant? Does there just exist
>some probability of Thallium emission given by the fraction of thallium
>in the crystal, or is it something more complex?

>Thanks for any insight.

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1 None: Re: Scintillation Process Question   (jdswado@gatech.edu - 20 Apr, 2009)
(_ None: Re: Scintillation Process Question   (Benton Pahlka - 20 Apr, 2009)
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