Caesium-137
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Caesium-137 (13755Cs), cesium-137 (US), or radiocaesium, is a radioactive isotope of caesium that is formed as one of the more common fission products by the nuclear fission of uranium-235 and other fissionable isotopes in nuclear reactors and nuclear weapons. Trace quantities also originate from spontaneous fission of uranium-238. It is among the most problematic of the short-to-medium-lifetime f
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Accuracy is not guaranteed.
.jpg) A sealed caesium-137 radioactive source | |
| General | |
|---|---|
| Symbol | Cs |
| Names | caesium-137 |
| Protons (Z) | 55 |
| Neutrons (N) | 82 |
| Nuclide data | |
| Natural abundance | 0 (trace) |
| Half-life (t1/2) | 30.04 years |
| Isotope mass | 136.907 Da |
| Spin | 7⁄2+ |
| Parent isotopes | Xe (β) |
| Decay products | Ba Ba |
| Decay modes | |
| Decay mode | Decay energy (MeV) |
| β- (beta decay) | 0.5120 |
| γ (gamma-rays) | 0.6617 |
| Isotopes of caesium Complete table of nuclides | |
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