In the beta decay of an atom of Co60, the radiation you would expect is one or two gamma rays, plus an electron plus an electron neutrino (and in the nucleus Ni60+, if I understand it well).
However, in the source of Co60 I'm using, I only hear about the gamma rays. Where are the electrons going? Do they stay "inside" the source, trapped because of the positive charge of the atomic nuclei? Should we see more photons in this case?