title: The use of 226Ra as a quality control check source for the beta-gamma coincidence counting of 131I.
mesh_terms: D007457:Iodine Radioisotopes / Q000032:analysis*; D011786:Quality Control; D011874:Radiometry / Q000295:instrumentation / Q000592:standards*; D011883:Radium
chemical_list: D007457:Iodine Radioisotopes; D011883:Radium