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Isotopes of the Element Protactinium

[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

Protactinium has no naturally occurring isotopes.

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
2125.1 millisecondsAlpha Decay100.00%
2135.3 millisecondsAlpha Decay100.00%
21417 millisecondsAlpha Decay<= 100.00%
21514 millisecondsAlpha Decay100.00%
2160.15 secondsAlpha Decay~ 98.00%
Electron Capture~ 2.00%
2173.6 millisecondsAlpha Decay100.00%
217m1.2 millisecondsAlpha Decay73.00%
Isomeric Transition27.00%
218113 microsecondsAlpha Decay100.00%
21953 nanosecondsAlpha Decay100.00%
2200.78 microsecondsAlpha Decay100.00%
Electron Capture3.0×10-7 %
2215.9 microsecondsAlpha Decay100.00%
2222.9 millisecondsAlpha Decay100.00%
2235.1 millisecondsAlpha Decay100.00%
2240.85 secondsAlpha Decay100.00%
2251.7 secondsAlpha Decay100.00%
2261.8 minutesAlpha Decay74.00%
Electron Capture26.00%
22738.3 minutesAlpha Decay85.00%
Electron Capture15.00%
22822.4 hoursElectron Capture98.15%
Alpha Decay1.85%
2291.50 daysElectron Capture99.52%
Alpha Decay0.48%
23017.4 daysElectron Capture92.20%
Beta-minus Decay7.80%
Alpha Decay3.2×10-3 %
2313.276×10+4 yearsAlpha Decay100.00%
Spontaneous Fission<= 2×10-11 %
2321.32 daysBeta-minus Decay100.00%
Electron CaptureNo Data Available
23326.975 daysBeta-minus Decay100.00%
2346.70 hoursBeta-minus Decay100.00%
234m1.159 minutesBeta-minus Decay99.84%
Isomeric Transition0.16%
23524.44 minutesBeta-minus Decay100.00%
2369.1 minutesBeta-minus Decay100.00%
2378.7 minutesBeta-minus Decay100.00%
2382.27 minutesBeta-minus Decay100.00%
2391.8 hoursBeta-minus Decay100.00%
240No Data AvailableBeta-minus Decay (suspected)No Data Available
241No Data AvailableNo Data AvailableNo Data Available