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Isotopes of the Element Radon

[Click for Main Data]

Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.

Naturally Occurring Isotopes

Radon has no naturally occurring isotopes.

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
1931.15 millisecondsAlpha Decay100.00%
1940.78 millisecondsAlpha Decay100.00%
1956 millisecondsAlpha Decay100.00%
195m5 millisecondsAlpha Decay100.00%
1964.4 millisecondsAlpha Decay99.90%
Electron Capture~ 0.10%
19753 millisecondsAlpha Decay100.00%
197m25 millisecondsAlpha Decay100.00%
19865 millisecondsAlpha DecayNo Data Available
Electron CaptureNo Data Available
1990.59 secondsAlpha Decay94.00%
Electron Capture6.00%
199m0.31 secondsAlpha Decay97.00%
Electron Capture3.00%
2001.03 secondsAlpha Decay86.00%
Electron Capture14.00%
2017.0 secondsAlpha DecayNo Data Available
Electron CaptureNo Data Available
201m3.8 secondsElectron CaptureNo Data Available
Alpha DecayNo Data Available
2029.7 secondsAlpha Decay78.00%
Electron Capture22.00%
20344 secondsAlpha Decay66.00%
Electron Capture34.00%
203m26.9 secondsAlpha Decay75.00%
Electron Capture25.00%
20474.5 secondsAlpha Decay72.40%
Electron Capture27.60%
205170 secondsAlpha Decay24.60%
Electron Capture75.40%
2065.67 minutesAlpha Decay62.00%
Electron Capture38.00%
2079.25 minutesElectron Capture79.00%
Alpha Decay21.00%
20824.35 minutesAlpha Decay62.00%
Electron Capture38.00%
20928.5 minutesElectron Capture83.00%
Alpha Decay17.00%
2102.4 hoursElectron Capture4.00%
Alpha Decay96.00%
21114.6 hoursElectron Capture72.60%
Alpha Decay27.40%
21223.9 minutesAlpha Decay100.00%
21319.5 millisecondsAlpha Decay100.00%
2140.27 microsecondsAlpha Decay100.00%
2152.30 microsecondsAlpha Decay100.00%
21645 microsecondsAlpha Decay100.00%
2170.54 millisecondsAlpha Decay100.00%
21835 millisecondsAlpha Decay100.00%
2193.96 secondsAlpha Decay100.00%
22055.6 secondsAlpha Decay100.00%
22125 minutesBeta-minus Decay78.00%
Alpha Decay22.00%
2223.8235 daysAlpha Decay100.00%
22324.3 minutesBeta-minus Decay100.00%
224107 minutesBeta-minus Decay100.00%
2254.66 minutesBeta-minus Decay100.00%
2267.4 minutesBeta-minus Decay100.00%
22720.8 secondsBeta-minus Decay100.00%
22865 secondsBeta-minus Decay100.00%
22912.0 secondsBeta-minus Decay100.00%
230> 300 nanosecondsBeta-minus DecayNo Data Available
231> 300 nanosecondsBeta-minus DecayNo Data Available