Decay mode and Half-life of Uranium 235
- Uranium 235 decays via alpha decay (by way of thorium-231) into 231Pa.
- The half-life of uranium 235 is ~7 x 108 years.
- Uranium 235 occasionally decays by spontaneous fission with very low probability of 0.0000000072%.
- Its specific activity is very low ~2.2×10-6 Ci/g.
| Isotope | Specific Activity |
|---|---|
| Uranium 232 | 22 Ci/g |
| Uranium 233 | 0.0098 Ci/g |
| Uranium 234 | 0.0063 Ci/g |
| Uranium 236 | 0.000065 Ci/g |
| Uranium 235 | 0.0000022 Ci/g |
| Uranium 238 | 0.00000034 Ci/g |
Table of specific activities of isotopes of uranium.