Dear Experts,
I am trying to inject gammas from Cs137 source in my simulation.
I had tried by specifying that in .mac file as below
/gun/particle ion
/gun/ion 55 137
But when I am printing the energy in my Primary generator as
fParticlegun->GetParticleEnergy() then i am always getting 1000.
Please suggest how to proceed.
If there is any small example to just check this then it will be great help.
Regards,
Raman
The primary is the Cs-137 ion itself. So I guess that you’re setting your Cs-137 ion to have an energy of 1 GeV (1000*MeV). If you want to see the gammas, you need to be looking at the secondaries after the Cs-137 decays. And you probalby want to set the primary energy to zero.
Could one build a physical volume consisting of some isotope, or it has to be a volume source with zero energy?
No, you cannot make a source out of G4Isotope material. That’s used only for geometry materials (density, Z & A, etc.).
An isotope source would consist of G4ParticleGun, G4GeneralParticleSource, or your own generator creating G4PrimaryParticle objects with G4Ions. If you want to restrict them to a particular region, you would do that by limiting the coordinates of the corresponding G4PrimaryVertex. GPS can do that for you automatically.