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ion123Iodine-123 (123 I) is a radioactive isotope of iodine used in nuclear medicine imaging, including single-photon emission computed tomography (SPECT) or SPECTCT exams. The isotope's half-life is 13.2232 hours; [1] the decay by8 Followers, 198 Following, 0 Posts - See photos and videos from ion (@ion123._)