Iodine-131 (I-131) is a radioisotope of iodine, which is a chemical element with the symbol I and atomic number 53. I-131 has a half-life of about 8 days, which means that it takes approximately 8 days for half of a given quantity of the isotope to decay. This decay produces beta and gamma radiation.
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An iodine radionuclide with approximately eight-day half-life, emitting beta particles and gamma rays. Its uptake and retention depend strongly on the carrier and tissue physiology.