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> I'd like to know how many electrons were produced by my incoming gamma
> radiation and how much energy they deposited in the crystal volume.
You can count electrons in StackingAction.
All energy deposited in your crystal is from charge particles (except a small portion below your range cut whose kinetic energy is attributed as energy lost by the gamma). There are many examples showing you how to collect energy deposition (either in SteppingAction or as 'hits').
is a good tool to browse example code. You should also consult slides presented at G4 schools; most recent one at:
http://indico.in2p3.fr/conferenceTimeTable.py?confId=443 (go to Agenda)
(as for your question about the absorption length of NaI(Tl) you need to do some 'google' or library research)