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Xenon-135 (135 Xe) is an unstable isotope of xenon with a half-life of about 9.2 hours. 135 Xe is a fission product of uranium and it is the most powerful known neutron-absorbing nuclear poison (2 million barns; [1] up to 3 million barns [1] under reactor conditions [2]), with a significant effect on nuclear reactor operation.
Of known isomers, the longest-lived is 131m Xe with a half-life of 11.934 days. 129 Xe is produced by beta decay of 129 I (half-life: 16 million years); 131m Xe, 133 Xe, 133m Xe, and 135 Xe are some of the fission products of both 235 U and 239 Pu, so are used as indicators of nuclear explosions. The artificial isotope 135 Xe is of considerable ...
One of the common fission products is 135 Te, which undergoes beta decay with half-life of 19 seconds to 135 I. 135 I itself is a weak neutron absorber. It builds up in the reactor in the rate proportional to the rate of fission, which is proportional to the reactor thermal power. 135 I undergoes beta decay with half-life of 6.57 hours to 135 Xe.
This is a list of radioactive nuclides (sometimes also called isotopes), ordered by half-life from shortest to longest, in seconds, minutes, hours, days and years. Current methods make it difficult to measure half-lives between approximately 10 −19 and 10 −10 seconds.
Caesium-134 is found in spent nuclear fuel but is not produced by nuclear weapon explosions, as it is only formed by neutron capture on stable Cs-133, which is only produced by beta decay of Xe-133 with a half-life of 3 days. Cs-134 has a half-life of 2 years and may be a major source of gamma radiation in the first 20 years after discharge.
The low decay energy, lack of gamma radiation, and long half-life of 135 Cs make this isotope much less hazardous than 137 Cs or 134 Cs. Its precursor 135 Xe has a high fission product yield (e.g., 6.3333% for 235 U and thermal neutrons ) but also has the highest known thermal neutron capture cross section of any nuclide.
A transgender military pilot posted a "proof of life" video to refute social media rumors that she flew the helicopter involved in the plane crash that killed 67 people.
[83] 129 Xe is produced by beta decay of 129 I, which has a half-life of 16 million years. 131m Xe, 133 Xe, 133m Xe, and 135 Xe are some of the fission products of 235 U and 239 Pu, [75] and are used to detect and monitor nuclear explosions.