title: The assay of iodine-123.
abstract: Compounds labeled with 123I are becoming more common in scintillation imaging due to the convenient combination of the 13.3-hr half-life and the 159-keV gamma radiation. Here attention is drawn to the particularly large summing effects observed when 123I is counted in a well counter. These could lead to errors in the assay of doses if the analyzer windows used are too narrow.
mesh_terms: D007457:Iodine Radioisotopes; D011874:Radiometry / Q000295:instrumentation; D011877:Radionuclide Imaging
chemical_list: D007457:Iodine Radioisotopes