How much cu64 would remain from a 2mg sample after 12 hours?

If you bind an antibody with an isotope eg Cu 64 Is this considered a radiopharmaceutical or is the Cu the radiopharmaceutical?

A radiopharmaceutical is that copmound which contains a radiocative nuclide within and can be used safely for diagnosis or treatment of an abnormal state or a disease state. According to this accepted definition of a radiopharmaceutical, the answer should be, yes , an antibody bound Cu64 can be considered a radiopharmaceutical.