title: Estimation of specific radioactivity of radioimmunoassay tracer by a double-labelling technique.
mesh_terms: D000818:Animals; D002116:Calcitonin / Q000032:analysis*; D005260:Female; D006801:Humans; D007457:Iodine Radioisotopes; D007553:Isotope Labeling / Q000379:methods*; D012756:Sheep
chemical_list: D007457:Iodine Radioisotopes; D002116:Calcitonin