NCIt synonyms : Iodine 123; I-123; Isotope of Mass 123; Iodine I 123;
NCIt definition : A radioactive isotope of iodine, a nonmetallic element of the halogen group with an
atomic mass of 123 and a half-life of 13.2 hours with radioisotopic activity. Selectively
accumulating in thyroid tissue, iodine I 123 emits gamma rays that can be detected
with gamma scintigraphy, allowing localization of thyroid tissue. This agent may be
used as a tracer in whole body scintigraphy (WBS) to localize thyroid carcinoma metastases.;