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The Periodic Table of Elements

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Actinium

Isotopes of the Element Radium

[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.

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
2011.6 millisecondsAlpha Decay100.00%
Electron CaptureNo Data Available
20216 millisecondsAlpha Decay100.00%
20331 millisecondsAlpha Decay100.00%
203m24 millisecondsAlpha Decay100.00%
20457 millisecondsAlpha Decay100.00%
205210 millisecondsAlpha Decay<= 100.00%
Electron CaptureNo Data Available
205m170 millisecondsAlpha Decay<= 100.00%
Electron CaptureNo Data Available
2060.24 secondsAlpha Decay100.00%
2071.35 secondsAlpha Decay~ 86.00%
Electron Capture~ 14.00%
207m59 millisecondsIsomeric Transition>= 85.00%
Alpha Decay<= 15.00%
2081.3 secondsAlpha Decay95.00%
Electron Capture5.00%
2094.6 secondsAlpha Decay~ 90.00%
Electron Capture~ 10.00%
2103.7 secondsAlpha Decay~ 96.00%
Electron Capture~ 4.00%
21113 secondsAlpha Decay> 93.00%
Electron Capture< 7.00%
21213.0 secondsAlpha Decay~ 85.00%
Electron Capture~ 15.00%
2132.73 minutesAlpha Decay80.00%
Electron Capture20.00%
213m2.20 millisecondsIsomeric Transition~ 99.40%
Alpha Decay~ 0.60%
2142.46 secondsAlpha Decay99.94%
Electron Capture0.06%
2151.55 millisecondsAlpha Decay100.00%
216182 nanosecondsAlpha Decay100.00%
Electron Capture< 1.0×10-8 %
2171.6 microsecondsAlpha Decay100.00%
21825.2 microsecondsAlpha Decay100.00%
21910 millisecondsAlpha Decay100.00%
22018 millisecondsAlpha Decay100.00%
22128 secondsAlpha Decay100.00%
Emission of a carbon-14 nucleus1×10-12 %
22238.0 secondsAlpha Decay100.00%
Emission of a carbon-14 nucleus3.0×10-8 %
22311.43 daysAlpha Decay100.00%
Emission of a carbon-14 nucleus8.9×10-8 %
2243.6319 daysAlpha Decay100.00%
Emission of a carbon-14 nucleus4.0×10-9 %
22514.9 daysBeta-minus Decay100.00%
2261600 yearsAlpha Decay100.00%
Emission of a carbon-14 nucleus3.2×10-9 %
22742.2 minutesBeta-minus Decay100.00%
2285.75 yearsBeta-minus Decay100.00%
2294.0 minutesBeta-minus DecayNo Data Available
23093 minutesBeta-minus Decay100.00%
231104.1 secondsBeta-minus Decay100.00%
2324.2 minutesBeta-minus Decay100.00%
23330 secondsBeta-minus Decay100.00%
23430 secondsBeta-minus Decay100.00%
235No Data AvailableNo Data AvailableNo Data Available