1/17/2024 0 Comments Xenon atomic emission spectrum![]() ![]() Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. "Global distribution of 129I in rivers and lakes: Implications for iodine cycling in surface reservoirs". "129I and 36Cl in dilute hydrocarbon waters: Marine-cosmogenic, in situ, and anthropogenic sources". Principles of Stellar Evolution and Nucleosynthesis (2nd ed.). "I-129 and Cl-36 in dilute hydrocarbon waters: Marine-cosmogenic,in situ, and anthropogenic sources". " 129Iodine: A new tracer for surface water/groundwater interaction" (PDF). "Iodine-129 as a "Nonradioactive" Tracer". Proceedings International High-Level Radioactive Waste Management Conference. "Partitioning and transmutation of long-lived fission products". ^ Archived at the Wayback Machine, NNDC Chart of Nuclides, I-129 Thermal neutron capture cross-section, accessed 1.^, NNDC Chart of Nuclides, I-129 Decay Radiation, accessed.^ "Radioactives Missing From The Earth"."Iodine-129: Its Occurrenice in Nature and Its Utility as a Tracer". "The AME2016 atomic mass evaluation (II). "The NUBASE2016 evaluation of nuclear properties" (PDF). This supernova source may also have caused collapse of the solar gas cloud. Molecular weight: 131.293 IUPAC Standard InChI: InChI1S/Xe IUPAC Standard InChIKey: FHNFHKCVQCLJFQ-UHFFFAOYSA-N CAS Registry Number: Chemical structure: This structure is also available as a 2d Mol file Other names: Xe UN 2036 UN 2591 Xenon atom Xeneisol 133A Xenomatic Permanent link for this species. These two events (supernova and solidification of gas cloud) were inferred to have happened during the early history of the Solar System, as the 129I isotope was likely generated before the Solar System was formed, but not long before, and seeded the solar gas cloud isotopes with isotopes from a second source. As the half-life of 129I is comparatively short in astronomical terms, this demonstrated that only a short time had passed between the supernova and the time the meteorites had solidified and trapped the 129I. This isotope is produced in quantity in nature only in supernova explosions. He inferred that this must be a decay product of long-decayed radioactive 129I. Reynolds discovered that certain meteorites contained an isotopic anomaly in the form of an overabundance of 129Xe. See also: Radiometric dating § The 129I– 129Xe chronometer Since 129I has a modest neutron absorption cross-section of 30 barns, and is relatively undiluted by other isotopes of the same element, it is being studied for disposal by nuclear transmutation by re-irradiation with neutrons or by high-powered lasers. In a deep geological repository for unreprocessed used fuel, 129I is likely to be the radionuclide of most potential impact at long times. Larger proportions of other iodine isotopes such as 131I are produced, but because these all have short half-lives, iodine in cooled spent nuclear fuel consists of about 5⁄ 6 129I and 1⁄ 6 the only stable iodine isotope, 127I.īecause 129I is long-lived and relatively mobile in the environment, it is of particular importance in long-term management of spent nuclear fuel. Fission product ġ29I is one of the seven long-lived fission products that are produced in significant amounts. Formula: Xe Molecular weight: 131.293 IUPAC Standard InChI: InChI1S/Xe IUPAC Standard InChIKey: FHNFHKCVQCLJFQ-UHFFFAOYSA-N CAS Registry Number: Chemical structure: This structure is also available as a 2d Mol file Other names: Xe UN 2036 UN 2591 Xenon atom Xeneisol 133A Xenomatic Permanent link for this species. ġ29I decays with a half-life of 15.7 million years, with low-energy beta and gamma emissions, to stable xenon-129 ( 129Xe). It is also naturally produced in small quantities, due to the spontaneous fission of natural uranium, by cosmic ray spallation of trace levels of xenon in the atmosphere, and by cosmic ray muons striking tellurium-130. Significant amounts were released into the atmosphere as a result of nuclear weapons testing in the 1950s and 1960s. It is primarily formed from the fission of uranium and plutonium in nuclear reactors. ^ Lower in thermal reactors because 135Xe, its predecessor, readily absorbs neutrons.ġ29I is one of seven long-lived fission products.^ Has decay energy 380 keV, but its decay product 126Sb has decay energy 3.67 MeV.^ Per 65 thermal neutron fissions of 235U and 35 of 239Pu.^ Decay energy is split among β, neutrino, and γ if any. ![]()
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