Radsafers: I'm screening copper bars for a client. They are 1/4 in thick by 4 in wide by about 1 foot long. They were used years ago in accelerator windings, and contain some cobalt-60 activity (Cu-64 + n, alpha = Co-60). Can anybody tell me some other photon-emitting isotopes that might result from copper activation so I can put them in the gamma spec library?