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Forum: Event and Track Management
Re: Question Gamma position and energy in Ra222 decay chain (Alexis Brosssard)
Date: 23 Mar, 2015
From: michel maire <michel maire>

On Mon, 23 Mar 2015 17:34:54 GMT, Alexis Brosssard wrote:
> Hello,
> 
> I am working on spherical particles detector. This detector is simply
> composed by a copper sphere filled with gas. I simulate radon decay
> outside the gas sphere, and all the decay chain, it means five gamma
> photons are emitted during the process. For each gamma photon which
> interact on the gas volume, I'd know the initial position where the
> gamma photon was emitted and their initial energy. I tried to use
> G4primaryvertex, but this class give me information only on the first
> particle, the radon atom. Is there a class which allow to have these
> informations? Thanks
> 
> Cheers,
> 
> Alexis
> 

 To complement Peter answer :
 You have the hand at begin of each track in TrackingAction::PreUserTrackingAction()

 See examples/extended/electromagnetic/TestEm1

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