|Message: Re: Can we apply the boundary process to gamma-ray photons? If we can, and how to do it?||Not Logged In (login)|
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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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