 Notable Isotopes  |
|
 124Xe [70 neutrons] |
 Abundance: 0.1%
|
| Half life: 1.1 x 1017 years [ Double Electron Capture ]
|
| Decay Energy: ? MeV |
| Decays to 124Te.
|
|
| 125Xe [71 neutrons] |
| Abundance: synthetic
|
| Half life: 16.9 hours [ Electron Capture ]
|
| Decay Energy: 1.652 MeV |
| Decays to 125I.
|
|
| 126Xe [72 neutrons] |
| Abundance: 0.09%
|
| Stable with 72 neutrons
|
|
| 127Xe [73 neutrons] |
| Abundance: synthetic
|
| Half life: 36.4 days [ Electron Capture ]
|
| Decay Energy: 0.662 MeV |
| Decays to 127I.
|
|
| 128Xe [74 neutrons] |
| Abundance: 1.91%
|
| Stable with 74 neutrons
|
|
| 129Xe [75 neutrons] |
| Abundance: 26.4%
|
| Stable with 75 neutrons
|
| Excess 129Xe found in carbon dioxide well gases from New Mexico was believed to be from the decay of mantle-derived gases soon after
Earth's formation.
|
|
|
| 130Xe [76 neutrons] |
| Abundance: 4.1%
|
| Stable with 76 neutrons
|
|
| 131Xe [77 neutrons] |
| Abundance: 21.29%
|
| Stable with 77 neutrons
|
|
| 132Xe [78 neutrons] |
| Abundance: 26.9%
|
| Stable with 78 neutrons
|
|
| 133Xe [79 neutrons] |
| Abundance: synthetic
|
| Half life: 5.243 days [ beta- ]
|
| Decay Energy: 0.427 MeV |
| Decays to 133Cs.
|
|
| 134Xe [80 neutrons] |
| Abundance: 10.4%
|
| Stable with 80 neutrons
|
|
| 135Xe [81 neutrons] |
| Abundance: synthetic
|
| Half life: 9.10 hours [ beta- ]
|
| Decay Energy: 1.16 MeV |
| Decays to 135Cs.
|
| 135Xe is of considerable significance in the operation of nuclear fission reactors. 135Xe has a huge cross section for thermal neutrons, 2.6 x 106 barns, so it acts as a neutron absorber or "poison" that can slow or stop the chain reaction after a period of operation.
|
|
|
| 136Xe [82 neutrons] |
| Abundance: 8.9%
|
| Half life: 2.36 x 1021 years [ beta- ]
|
| Decay Energy: ? MeV |
| Decays to 136Ba.
|