An assembly of diagnostic devices that comprise a non-imaging nuclear medicine system designed primarily for radioactive iodine related thyroid uptake measurement and analysis applications. It can typically be upgraded with the addition of software and hardware for use in various quality assurance (QA) or radioimmunoassay laboratory applications, e.g., wipe-test assessment or Schilling tests. It typically includes a multichannel analyser, computer, scintillation detector, detector support equipment, an operator's console, video display, well counter detector, collimator, shielding, and application software.