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Cobalt-60



Does decaying Cobalt-60 usually give off _both_ a 1.17 MeV gamma and a 1.33
MeV gamma? We use Co-60 in an experiment to measure the half-value layer
of Aluminum for those gammas, and I'm not quite sure what the right answer
is if I don't know the relative frequencies of the two energies.

Thanks,
Larry