CAS 7440-59-7 Chemical Asphyxiant UN 1046 Isotopic Gases Xe - 133

CAS 7440-59-7 Chemical Asphyxiant UN 1046 Isotopic Gases Xe - 133

Description:

133Xe is a heavy, colorless, odorless, high pressure, noble gas. Xenon-133 is an isotope of xenon. It is a radionuclide that was inhaled to assess pulmonary function, and to image the lungs. It is also used to image blood flow, particularly in the brain. 133Xe is also an important fission product.

The element Xenon has 9 stable isotopes. Naturally occurring xenon (Xe) is made of eight stable isotopes and one very long-lived isotope. (124Xe, 126Xe, and 134Xe are predicted to undergo double beta decay,[citation needed] but this has never been observed in these isotopes, so they are considered to be stable.) Xenon has the second highest number of stable isotopes. Only tin, with 10 stable isotopes, has more. Beyond these stable forms, there are over 30 unstable isotopes and isomers that have been studied, the longest-lived of which is 136Xe, which undergoes double beta decay with a half-life of 2.165 ± 0.016(stat) ± 0.059(sys) ×1021 years with the next longest lived being 127Xe with a half-life of 36.345 days. Of known isomers, the longest-lived is 131mXe with a half-life of 11.934 days. 129Xe is produced by beta decay of 129I (half-life: 16 million years); 131mXe, 133Xe, 133mXe, and 135Xe are some of the fission products of both 235U and 239Pu, and therefore used as indicators of nuclear explosions.

Under adverse conditions, relatively high concentrations of radioactive xenon isotopes may be found emanating from nuclear reactors due to the release of fission products from cracked fuel rods, or fissioning of uranium in cooling water.

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Xenon-133 is an isotope of xenon. It is a radionuclide that was inhaled to assess pulmonary function, and to image the lungs. It is also used to image blood flow, particularly in the brain. 133Xe is also an important fission product.

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