Define Cs137 by GPS

Hello,

  1. Geant4 simulates particles not activities. beamOn 100 means 100 particles are simulated.
    We had a similiar question here:
    Statistical error / uncertainty - #11 by BenjaminW

  2. “stable” means this isotope is stable and does not decay. i need two columns for my analysis so i decided to use print “stable” twice.

Regards
Max