<unk>  is a Diagnostic Agent that is FDA approved for the diagnosis of Hodgkins disease, lymphomas and bronchogenic carcinoma.   Common adverse reactions include itching, erythema, and rash.
Gallium Citrate Ga 67
Thallous Chloride Tl 201
Technetium 
Phosphorus oxoacids
Rubidium Rb 82
Indium oxyquinoline
Chromate
Bromide