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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.

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