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Forum: Physics List
Re: Question Can we apply the boundary process to gamma-ray photons? If we can, and how to do it?
Date: 21 May, 2013
From: Michael H. Kelsey <Michael H. Kelsey>

On Tue, 21 May 2013 01:36:57 GMT, zhaodh01 wrote:
> Hi everybody,
> 
> Generally, we can apply the boundary processes including the total
> internal reflection, refraction and reflection to the optical photons in
> Geant4. However, the total internal reflection is usually used for
> gamma-ray photons (a few keV or more) in practice.
> 
> So, I have some questions here:
> 
> 1) Are the optical photons in Geant4 the photons with energy less than
> 0.1 keV?

Programmatically, opticalphotons are entirely different objects than photons. They can be assigned whatever energy you wish, provided you can define optical material properties corresponding to that energy. Optical-photons *WILL NOT* participate in any "true photon" (gamma ray) interactions, like ionization, photo-nuclear, or anything else.

> 2) Can we apply the boundary process to gamma photons?

No. Boundary processes apply to the "opticalphoton" particle type. "True" photons propagate like other high-energy particles and interact in material through the EM and photo-nuclear processes registered in your physics list.

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1 Question: Re: Can we apply the boundary process to gamma-ray photons? If we can, and how to do it?   (zhaodh@bao.ac.cn - 28 May, 2013)
(_ None: Re: Can we apply the boundary process to gamma-ray photons? If we can, and how to do it?   (Mike Kelsey - 28 May, 2013)
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