Gun more than one particle ion

Dear users!
When gun more than one ion source, just the end ion source appears.
For example, when I want to make two ion sources like Co-60 and Cs-137 as follow:
/gun/particle ion
/gun/ion 27 60
/gun/ion 55 137
I see just the end one in the root file histogram.
Is it possible to see both ion sources in the same histogram?

Not with G4ParticleGun. As you’ll see from G4ParticleGun.hh, there is one single data member for the particle type. If you need more complex sources, you may want to investigate G4GeneralParticleSource (/gps/... macro commands) your you can write your own G4UserPrimaryGeneratorAction with whatever complexity you need.

You may wish to have a look at example: extended/eventgenerator/userPrimaryGenerator which even do not use G4ParticleGun.

Thank you all for your Reply