iodine 131
noun Chemistry.
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.
Compare
radioiodine.
Words nearby iodine 131
iodic acid,
iodide,
iodimetry,
iodinate,
iodine,
iodine 131,
iodine stain,
iodine-123,
iodine-125,
iodine-131,
iodine-fast
Medical definitions for iodine-131
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.