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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.
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 ...
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A compound with iodine(V) would be a λ 5 ‑iodane, and a hypothetical iodine(VII)‑containing compound would be a λ 7 ‑iodane. Organyl-iodine ethers, a kind of λ 3 ‑iodane, are sometimes called organic hypoiodites. Alternatively, the hypervalent iodines can be classified using neutral electron counting.
The table in the next section ("Ordered by yield") gives yields for notable radioactive (with half-lives greater than one year, plus iodine-131) fission products, and (the few most absorptive) neutron poison fission products, from thermal neutron fission of U-235 (typical of nuclear power reactors), computed from [permanent dead link ].
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Jablonski diagram including vibrational levels for absorbance, non-radiative decay, and fluorescence.. When a molecule absorbs a photon, the photon energy is converted and increases the molecule's internal energy level.