[A radioactive isotope of iodine, a nonmetallic element of the halogen group, with an atomic mass of 124 and a half-life of 4.18 days with radioimaging property. Selectively accumulating in thyroid glands, iodine I 124 releases, in addition to gamma rays, positrons that can be captured by positron emission tomography (PET) to allow assessment of thyroid function. When coupled with other compounds, such as a monoclonal antibody, iodine I 124 can be used for tissue-specific radioimaging and therapy. ( NCI )]
UMLS (NCI) C0303024 
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