and I can simulate a particle source using the GPS, for example
########## Particles ##########
/gps/particle gamma
/gps/energy 1808.65 keV
/gps/pos/type Volume
/gps/pos/shape Sphere
/gps/pos/centre .0 .0 3.67 cm
/gps/pos/radius 7.25 cm
/gps/pos/inner_radius .0 mm
/gps/pos/halfz 16.4 cm
/gps/ang/type iso
/gps/source/intensity 1
/gps/pos/confine sample
########## Number of particles ##########
/run/printProgress 10
/run/beamOn 100
Now instead of using the single photons (as I do in in the sketch of the macro), my source has to be radionuclide dacay. In particular I’ve to simulate the decays of Am-241, Co-60, Cs-137, Cs-134, Pb-210.
What should I do to use the radionuclide decays as source?