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131 I is a fission product with a yield of 2.878% from uranium-235, [14] and can be released in nuclear weapons tests and nuclear accidents. However, the short half-life means it is not present in significant quantities in cooled spent nuclear fuel, unlike iodine-129 whose half-life is nearly a billion times that of 131 I.
Twenty-three yoctoseconds is the time needed to traverse a 7-femtometre distance at the speed of light ... iodine-131: 8.02 693 polonium-206: 8.8 760 thulium-167: 9 ...
By 29 March iodine-131 levels in seawater 330 m south of a key discharge outlet had reached 138 Bq/mL (3,355 times the legal limit), [170] [171] and by 30 March, iodine-131 concentrations had reached 180 Bq/mL at the same location near the Fukushima Daiichi nuclear plant, 4,385 times the legal limit. [171]
US Highway 131 (US 131) is a north–south United States Highway, of which all but 0.64 of its 269.96 miles (1.03 of 434.46 km) are within the state of Michigan. The highway starts in rural Indiana south of the state line as a state road connection to the Indiana Toll Road .
Business US Highway 131 (Bus. US 131) is a 4.2-mile-long (6.8 km) business spur running north of downtown Kalamazoo. North of downtown, Westnedge Avenue curves northeasterly to run next to Park Street, and the two streets form the opposing two-lane carriageways of a freeway; this transition point marks the southern end of Bus. US 131.
129 I is one of the seven long-lived fission products that are produced in significant amounts. Its yield is 0.706% per fission of 235 U. [7] Larger proportions of other iodine isotopes such as 131 I are produced, but because these all have short half-lives, iodine in cooled spent nuclear fuel consists of about 5/6 129 I and 1/6 the only stable iodine isotope, 127 I.
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There are 40 known isotopes of iodine (53 I) from 108 I to 147 I; all undergo radioactive decay except 127 I, which is stable. Iodine is thus a monoisotopic element.. Its longest-lived radioactive isotope, 129 I, has a half-life of 16.14 million years, which is far too short for it to exist as a primordial nuclide.