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Forum: Physics List
Re: Question range-cut (lalageh)
Re: None Re: range-cut (Michael H. Kelsey)
Date: 30 Nov, 2015
From: michel maire <michel maire>

On Mon, 30 Nov 2015 03:27:11 GMT, Michael H. Kelsey wrote:
> On Sun, 29 Nov 2015 05:14:53 GMT, lalageh wrote:
> > I have a question regarding the range cuts in Geant4. Range-cuts in
> > Geant4 are defined as threshold below which no secondary particle will
> > be generated. I would like to know how photons are treated since they
> > have no range, is it the same mean free path in photon case?
> Photons do have an effective "range," referred to as the "radiation
> length" when passing through material. It is e-folding distance for
> attenuation of a beam. You're quite right that some photons will travel
> many many radiation lengths.

 For photons, "range" is defined as 5 Mean Free Path.
 Mean Free Path refers to total cross section : photoEffect + Compton + pair creation

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