It's Elemental

Francium

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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.

Naturally Occurring Isotopes

Radium has no naturally occurring isotopes.

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