Multi-channel gamma counter. Unit shall be an automatic gamma counter capable of quantitating hormones, vitamins, drugs, cancer antigen, enzymes, receptors, viruses, antibodies, polypeptides and other proteins. Shall provide a sensitive and specific analytical technique for measuring these analytes in patient samples (Serum, Urine or other body fluids) with detection limits in the nanogram (ng) (10-9g ) to picogram (10-12 g) range. Characteristics and components include personal computer data acquisition and analysis software, disk storage, constant quanta detector and dedicated computer.