碘-123

Iodine-123 is a radioactive isotope of Iodine, used in nuclear medicine imaging, including single photon emission computed tomography (SPECT). This isotope decays to tellurium-123 by electron capture, emitting gamma radiation [2] that can be detected by gamma cameras in medical applications. 123I is typically applied in its anionic form, iodide-123. 123I is the most suitable isotope of iodine for the diagnostic study of thyroid diseases [3]. The half-life of approximately 13.3 hours is ideal for the 24-hour iodine uptake test [1].