|Message: Re: PhotoCathodeHits for each gamma interaction vertex||Not Logged In (login)|
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You can use GetCreatorProcess to tell you what process produced the charge particle. You can use a UserTrackInformation class (derived from G4VUserTrackInformation) to hold this information for each photon generated by that charge particle together with the origin of the charge particle (in SteppingAction). When you get an optical photon at your photo cathode you can access this track information.
The optical examples wls and LXe are making extensive use of UserTrackInformation although do not exactly what you seem to require.
Please, read about UserTrackInformation etc. in our Application Developers Manual. Some useful code may be found at:
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