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Forum: Processes Involving Optical Photons
Re: Sad Transmission probability in an optical surface (Sahar )
Date: 02 Sep, 2015
From: Gumplinger Peter <Gumplinger Peter>

> I have a question about transmission at an optical surface.
> My surface is &#65533;ground front painted&#65533; which is a lambertian reflector. My
> material is dielectric &#65533; dielectric .

You can give such a surface (via G4OpticalSurface) a G4MaterialPropertiesTable with both "TRANSMITTANCE" and "REFLECTIVITY" (the probabilities of transmission and transmission) specified. The remainder of the sum of these two is the probability of absorption on the surface.

> The absorption length is 100 cm for my CsI scintillator.

This is the bulk absorption length inside the medium.

> Is there a way I can calculate the transmission
> probability of the incident particles (i.e. the optical photons) ?

The transmission is an empirical input parameter for the surface in G4.

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