title: Counter efficiency in gamma ray scintillation spectrometry as a factor affecting radioimmunoassays.
mesh_terms: D002272:Carcinoembryonic Antigen / Q000032:analysis; D005720:Gamma Rays; D011863:Radioimmunoassay / Q000592:standards*; D012588:Scintillation Counting / Q000592:standards*; D013051:Spectrometry, Gamma / Q000295:instrumentation
chemical_list: D002272:Carcinoembryonic Antigen