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Iodine-131 (131 I, I-131) is an important radioisotope of iodine discovered by Glenn Seaborg and John Livingood in 1938 at the University of California, Berkeley. [3] It has a radioactive decay half-life of about eight days. It is associated with nuclear energy, medical diagnostic and treatment procedures, and natural gas production.
The patient swallows a radioisotope of iodine in the form of capsule or fluid, and the absorption (uptake) of this radiotracer by the thyroid is studied after 4–6 hours and after 24 hours with the aid of a scintillation counter. The dose is typically 0.15–0.37 MBq (4–10 μCi) of 131 I iodide, or 3.7–7.4 MBq (100–200 μCi) of 123 I ...
Iodine-124 can be made by numerous nuclear reactions via a cyclotron. The most common starting material used is 124 Te. Iodine-124 as the iodide salt can be used to directly image the thyroid using positron emission tomography (PET). [9] Iodine-124 can also be used as a PET radiotracer with a usefully longer half-life compared with fluorine-18 ...
131 polonium-221: 2.2 130 neptunium-242: 2.2 130 protactinium-238: 2.27 136 neptunium-244: 2.29 137 mendelevium-252: 2.30 138 astatine-221: 2.3 140 americium-234: 2.32 139 lead-215: 2.34 140 berkelium-238: 2.40 144 bohrium-270: 2.4 140 seaborgium-271: 2.4 140 actinium-233: 2.42 145 francium-227: 2.47 148 astatine-224: 2.5 150 lawrencium-260: 2 ...
Large amounts of 131 I was released during an experiment named the Green Run [11] in which fuel which had only been allowed to cool for a short time after irradiation was reprocessed in a plant which had no iodine scrubber in operation. 129 I, with a half-life almost a billion times as long, is a long-lived fission product.
Another well-known radioactive isotope used in medicine is Iodine-131, which is used as a radioactive label for some radiopharmaceutical therapies or the treatment of some types of thyroid cancer. [2]
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Iodine-125 is a radioactive isotope of iodine that decays by electron capture with a physical half-life of 60.14 days. The biological half-life in normal individuals for iodine (125 I) human albumin has been reported to be approximately 14 days. Its radioactivity is excreted almost exclusively via the kidneys.