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Xenon-124 is an isotope of xenon that undergoes double electron capture to tellurium-124 with a very long half-life of 1.8 × 10 22 years, more than 12 orders of magnitude longer than the age of the universe ((13.799 ± 0.021) × 10 9 years).
half-life 10 15 years 10 24 seconds hafnium-174: 70 2.2 vanadium-50: 140 4.4 ... xenon-124: 18 570 10 30 seconds (quettaseconds) isotope half-life 10 24 years
In April 2019 it was announced that the half-life of xenon-124 had been measured to 1.8 × 10 22 years. This is the longest half-life directly measured for any unstable isotope; [4] only the half-life of tellurium-128 is longer. [citation needed]
Xenon-129 can be used to examine the early history of the Earth. 129 Xe was derived from the extinct nuclide of iodine, iodine-129 or 129 I (with a half-life of 15.7 Million years, or Myr), which can be used in iodine-xenon (I-Xe) dating.
The half-life of 123 Te is longer than 9.2 × 10 16 years, and probably much longer. [6] 124 Te can be used as a starting material in the production of radionuclides by a cyclotron or other particle accelerators. Some common radionuclides that can be produced from tellurium-124 are iodine-123 and iodine-124.
The longest-lived of these isotopes are the primordial 124 Xe, which undergoes double electron capture with a half-life of 1.8 × 10 22 yr, [82] and 136 Xe, which undergoes double beta decay with a half-life of 2.11 × 10 21 yr. [83] 129 Xe is produced by beta decay of 129 I, which has a half-life of 16 million years.
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Isotopes of xenon This page was last edited on 8 October 2010, at 02:01 (UTC) . Text is available under the Creative Commons Attribution-ShareAlike License 3.0 ; additional terms may apply.