It's Elemental
Isotopes of the Element Polonium
Polonium
Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 186 | No Data Available | No Data Available | No Data Available |
| 187 | 1.40 milliseconds | Alpha Decay | 100.00% |
| 188 | 0.275 milliseconds | Electron Capture | 100.00% |
| Alpha Decay | No Data Available | ||
| 189 | 3.5 milliseconds | Alpha Decay | 100.00% |
| 190 | 2.46 milliseconds | Alpha Decay | 100.00% |
| 191 | 22 milliseconds | Alpha Decay | 99.00% |
| 191m | 93 milliseconds | Alpha Decay | 96.00% |
| 192 | 32.2 milliseconds | Alpha Decay | ~ 99.50% |
| Electron Capture | ~ 0.50% | ||
| 193 | 245 milliseconds | Alpha Decay | <= 100.00% |
| 193m | 370 milliseconds | Alpha Decay | <= 100.00% |
| 194 | 0.392 seconds | Alpha Decay | 100.00% |
| Electron Capture | No Data Available | ||
| 195 | 4.64 seconds | Alpha Decay | 75.00% |
| Electron Capture | 25.00% | ||
| 195m | 1.92 seconds | Electron Capture | ~ 10.00% |
| Isomeric Transition | < 0.01% | ||
| Alpha Decay | ~ 90.00% | ||
| 196 | 5.8 seconds | Alpha Decay | ~ 98.00% |
| Electron Capture | ~ 2.00% | ||
| 197 | 84 seconds | Electron Capture | 56.00% |
| Alpha Decay | 44.00% | ||
| 197m | 32 seconds | Alpha Decay | 84.00% |
| Electron Capture | 16.00% | ||
| Isomeric Transition | 0.01% | ||
| 198 | 1.77 minutes | Alpha Decay | 57.00% |
| Electron Capture | 43.00% | ||
| 199 | 5.47 minutes | Electron Capture | 92.50% |
| Alpha Decay | 7.50% | ||
| 199m | 4.17 minutes | Electron Capture | 73.50% |
| Alpha Decay | 24.00% | ||
| Isomeric Transition | 2.50% | ||
| 200 | 11.51 minutes | Electron Capture | 88.90% |
| Alpha Decay | 11.10% | ||
| 201 | 15.6 minutes | Electron Capture | 98.87% |
| Alpha Decay | 1.13% | ||
| 201m | 8.96 minutes | Electron Capture | 41.40% |
| Alpha Decay | 2.40% | ||
| Isomeric Transition | 56.20% | ||
| 202 | 44.6 minutes | Electron Capture | 98.08% |
| Alpha Decay | 1.92% | ||
| 203 | 36.7 minutes | Electron Capture | 99.89% |
| Alpha Decay | 0.11% | ||
| 203m | 45 seconds | Isomeric Transition | 100.00% |
| Electron Capture | No Data Available | ||
| 204 | 3.519 hours | Electron Capture | 99.33% |
| Alpha Decay | 0.67% | ||
| 205 | 1.74 hours | Alpha Decay | 0.04% |
| Electron Capture | 99.96% | ||
| 205m | 0.645 milliseconds | Isomeric Transition | 100.00% |
| 205m1 | 57.4 milliseconds | Isomeric Transition | 100.00% |
| 206 | 8.8 days | Electron Capture | 94.55% |
| Alpha Decay | 5.45% | ||
| 207 | 5.80 hours | Electron Capture | 99.98% |
| Alpha Decay | 0.02% | ||
| 207m | 2.79 seconds | Isomeric Transition | 100.00% |
| 208 | 2.898 years | Alpha Decay | 100.00% |
| Electron Capture | 4.0×10-3 % | ||
| 209 | 102 years | Electron Capture | 0.48% |
| Alpha Decay | 99.52% | ||
| 210 | 138.376 days | Alpha Decay | 100.00% |
| 211 | 0.516 seconds | Alpha Decay | 100.00% |
| 211m | 25.2 seconds | Alpha Decay | 99.98% |
| Isomeric Transition | 0.02% | ||
| 212 | 0.299 microseconds | Alpha Decay | 100.00% |
| 212m | 45.1 seconds | Alpha Decay | 99.93% |
| Isomeric Transition | 0.07% | ||
| 213 | 3.72 microseconds | Alpha Decay | 100.00% |
| 214 | 164.3 microseconds | Alpha Decay | 100.00% |
| 215 | 1.781 milliseconds | Alpha Decay | 100.00% |
| Beta-minus Decay | 2.3×10-4 % | ||
| 216 | 0.145 seconds | Alpha Decay | 100.00% |
| 217 | 1.53 seconds | Alpha Decay | No Data Available |
| 218 | 3.098 minutes | Alpha Decay | 99.98% |
| Beta-minus Decay | 0.02% | ||
| 219 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
| 220 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
| 221 | 112 seconds | Beta-minus Decay (suspected) | No Data Available |
| 222 | 550 seconds | Beta-minus Decay (suspected) | No Data Available |
| 223 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
| 224 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
| 225 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
| 226 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
| 227 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
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