Most of the isotope data on this site has been obtained from the National Nuclear Data Center.
Naturally Occurring Isotopes
Plutonium has no naturally occurring isotopes.
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 228 | 1.1 seconds | Alpha Decay | 100.00% |
| 229 | 67 seconds | Electron Capture | 50.00% |
| Alpha Decay | 50.00% | ||
| Spontaneous Fission | < 7.00% | ||
| 230 | 102 seconds | Alpha Decay | <= 100.00% |
| 231 | 8.6 minutes | Electron Capture | <= 99.80% |
| Alpha Decay | > 0.20% | ||
| 232 | 33.8 minutes | Electron Capture | 90.00% |
| Alpha Decay | 10.00% | ||
| 233 | 20.9 minutes | Electron Capture | 99.88% |
| Alpha Decay | 0.12% | ||
| 234 | 8.8 hours | Electron Capture | ~ 94.00% |
| Alpha Decay | ~ 6.00% | ||
| 235 | 25.3 minutes | Electron Capture | 100.00% |
| Alpha Decay | 2.8×10-3 % | ||
| 236 | 2.858 years | Alpha Decay | 100.00% |
| Spontaneous Fission | 1.9×10-7 % | ||
| 237 | 45.64 days | Electron Capture | 100.00% |
| Alpha Decay | 4.2×10-3 % | ||
| 237m | 0.18 seconds | Isomeric Transition | No Data Available |
| 238 | 87.7 years | Alpha Decay | 100.00% |
| Spontaneous Fission | 1.9×10-7 % | ||
| 239 | 24110 years | Alpha Decay | 100.00% |
| Spontaneous Fission | 3×10-10 % | ||
| 240 | 6561 years | Alpha Decay | 100.00% |
| Spontaneous Fission | 5.7×10-6 % | ||
| 241 | 14.325 years | Beta-minus Decay | 100.00% |
| Alpha Decay | 2.5×10-3 % | ||
| Spontaneous Fission | < 2×10-14 % | ||
| 242 | 3.75×10+5 years | Alpha Decay | 100.00% |
| Spontaneous Fission | 5.5×10-4 % | ||
| 243 | 4.956 hours | Beta-minus Decay | 100.00% |
| 244 | 8.00×10+7 years | Alpha Decay | 99.88% |
| Spontaneous Fission | 0.12% | ||
| 245 | 10.5 hours | Beta-minus Decay | 100.00% |
| 246 | 10.84 days | Beta-minus Decay | 100.00% |
| 247 | 2.27 days | Beta-minus Decay | 100.00% |
This page is maintained by Steve Gagnon.