[Click for Main Data] Proton Emission Neutron Emission Electron Emission Positron Emission
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.