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Forum: Processes Involving Optical Photons
Re: None What does the "Absorption" mean in Cherenkov process (yanxin0221)
Date: 09 Jul, 2014
From: Gumplinger Peter <Gumplinger Peter>

> I've got some problem with the Cherenkov process!!

Your issue has to do with the G4OpAbsorption process - not the G4Cerenkov process.

> examples/novice/N06/DetectorConstruction.cc,there are the following code
> 
> G4double Absorption[nEntries] =
>            {3.448*m,  4.082*m,  6.329*m,  9.174*m, 12.346*m, 13.889*m,
>            15.152*m, 17.241*m, 18.868*m, 20.000*m, 26.316*m, 35.714*m,
>            45.455*m, 47.619*m, 52.632*m, 52.632*m, 55.556*m, 52.632*m,
>            52.632*m, 47.619*m, 45.455*m, 41.667*m, 37.037*m, 33.333*m,
>            30.000*m, 28.500*m, 27.000*m, 24.500*m, 22.000*m, 19.500*m,
>            17.500*m, 14.500*m };
> 
> What dose the Absorption mean? absorption length or other meanings?

From the G4 Appl. Dev. Guide:

Absorption

The implementation of optical photon bulk absorption, G4OpAbsorption, is trivial in that the process merely kills the particle. The procedure requires the user to fill the relevant G4MaterialPropertiesTable with empirical data for the absorption length, using ABSLENGTH as the property key in the public method AddProperty. The absorption length is the average distance traveled by a photon before being absorpted by the medium; i.e. it is the mean free path returned by the GetMeanFreePath method.

> And how can I get the "Absorption" of other materials.

If I recall, there is at least one posting on this Forum that has a link to material optical absorption data.

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