It's Elemental
Isotopes of the Element Radon
Radon
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 |
| 193 | 1.15 milliseconds | Alpha Decay | 100.00% |
| 194 | 0.78 milliseconds | Alpha Decay | 100.00% |
| 195 | 6 milliseconds | Alpha Decay | 100.00% |
| 195m | 5 milliseconds | Alpha Decay | 100.00% |
| 196 | 4.4 milliseconds | Alpha Decay | 99.90% |
| Electron Capture | ~ 0.10% | ||
| 197 | 53 milliseconds | Alpha Decay | 100.00% |
| 197m | 25 milliseconds | Alpha Decay | 100.00% |
| 198 | 65 milliseconds | Alpha Decay | No Data Available |
| Electron Capture | No Data Available | ||
| 199 | 0.59 seconds | Alpha Decay | 94.00% |
| Electron Capture | 6.00% | ||
| 199m | 0.31 seconds | Alpha Decay | 97.00% |
| Electron Capture | 3.00% | ||
| 200 | 1.03 seconds | Alpha Decay | 86.00% |
| Electron Capture | 14.00% | ||
| 201 | 7.0 seconds | Alpha Decay | No Data Available |
| Electron Capture | No Data Available | ||
| 201m | 3.8 seconds | Electron Capture | No Data Available |
| Alpha Decay | No Data Available | ||
| 202 | 9.7 seconds | Alpha Decay | 78.00% |
| Electron Capture | 22.00% | ||
| 203 | 44 seconds | Alpha Decay | 66.00% |
| Electron Capture | 34.00% | ||
| 203m | 26.9 seconds | Alpha Decay | 75.00% |
| Electron Capture | 25.00% | ||
| 204 | 74.5 seconds | Alpha Decay | 72.40% |
| Electron Capture | 27.60% | ||
| 205 | 170 seconds | Alpha Decay | 24.60% |
| Electron Capture | 75.40% | ||
| 206 | 5.67 minutes | Alpha Decay | 62.00% |
| Electron Capture | 38.00% | ||
| 207 | 9.25 minutes | Electron Capture | 79.00% |
| Alpha Decay | 21.00% | ||
| 208 | 24.35 minutes | Alpha Decay | 62.00% |
| Electron Capture | 38.00% | ||
| 209 | 28.5 minutes | Electron Capture | 83.00% |
| Alpha Decay | 17.00% | ||
| 210 | 2.4 hours | Electron Capture | 4.00% |
| Alpha Decay | 96.00% | ||
| 211 | 14.6 hours | Electron Capture | 72.60% |
| Alpha Decay | 27.40% | ||
| 212 | 23.9 minutes | Alpha Decay | 100.00% |
| 213 | 19.5 milliseconds | Alpha Decay | 100.00% |
| 214 | 0.27 microseconds | Alpha Decay | 100.00% |
| 215 | 2.30 microseconds | Alpha Decay | 100.00% |
| 216 | 45 microseconds | Alpha Decay | 100.00% |
| 217 | 0.54 milliseconds | Alpha Decay | 100.00% |
| 218 | 35 milliseconds | Alpha Decay | 100.00% |
| 219 | 3.96 seconds | Alpha Decay | 100.00% |
| 220 | 55.6 seconds | Alpha Decay | 100.00% |
| 221 | 25 minutes | Beta-minus Decay | 78.00% |
| Alpha Decay | 22.00% | ||
| 222 | 3.8235 days | Alpha Decay | 100.00% |
| 223 | 24.3 minutes | Beta-minus Decay | 100.00% |
| 224 | 107 minutes | Beta-minus Decay | 100.00% |
| 225 | 4.66 minutes | Beta-minus Decay | 100.00% |
| 226 | 7.4 minutes | Beta-minus Decay | 100.00% |
| 227 | 20.8 seconds | Beta-minus Decay | 100.00% |
| 228 | 65 seconds | Beta-minus Decay | 100.00% |
| 229 | 12.0 seconds | Beta-minus Decay | 100.00% |
| 230 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
| 231 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
Citation and linking information
For questions about this page, please contact Carol McKisson.