Iodine-131
noun, Chemistry.
1.
a radioactive isotope of iodine having a mass number 131 and a half-life of 8.6 days, used in the diagnosis and treatment of disorders of the thyroid gland.
iodine-131 n.
A radioisotope of iodine that emits beta and gamma rays, has a half-life of 8.05 days, and is used as a tracer in thyroid studies and as therapy in hyperthyroidism and thyroid cancer.
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