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Isotopes of the Element Americium

[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
230≈ 17 secondsElectron Capture100.00%
231No Data AvailableAlpha Decay (suspected)No Data Available
Electron Capture (suspected)No Data Available
23279 secondsElectron Capture~ 97.00%
Alpha Decay~ 3.00%
2333.2 minutesAlpha Decay> 3.00%
Electron CaptureNo Data Available
2342.32 minutesElectron Capture100.00%
Alpha DecayNo Data Available
23510.3 minutesAlpha Decay0.40%
Electron Capture99.60%
2363.6 minutesAlpha DecayNo Data Available
Electron CaptureNo Data Available
236m2.9 minutesAlpha DecayNo Data Available
Electron CaptureNo Data Available
23773.6 minutesElectron Capture99.97%
Alpha Decay0.03%
23898 minutesElectron Capture100.00%
Alpha Decay1.0×10-4 %
23911.9 hoursAlpha Decay0.01%
Electron Capture99.99%
24050.8 hoursElectron Capture100.00%
Alpha Decay1.9×10-4 %
240m0.94 millisecondsSpontaneous Fission<= 100.00%
241432.6 yearsAlpha Decay100.00%
Spontaneous Fission4×10-10 %
24216.02 hoursBeta-minus Decay82.70%
Electron Capture17.30%
242m141 yearsIsomeric Transition99.55%
Alpha Decay0.45%
Spontaneous Fission< 4.7×10-9 %
242m114.0 millisecondsSpontaneous Fission100.00%
Isomeric TransitionNo Data Available
Alpha Decay< 5.0×10-3 %
2437370 yearsAlpha Decay100.00%
Spontaneous Fission3.7×10-9 %
24410.1 hoursBeta-minus Decay100.00%
244m0.90 millisecondsSpontaneous Fission<= 100.00%
244m126 minutesBeta-minus Decay99.96%
Electron Capture0.04%
2452.05 hoursBeta-minus Decay100.00%
24639 minutesBeta-minus Decay100.00%
246m25.0 minutesBeta-minus Decay100.00%
Isomeric Transition< 0.02%
24723.0 minutesBeta-minus Decay100.00%
248≈ 10 minutesBeta-minus Decay100.00%
249No Data AvailableBeta-minus Decay (suspected)No Data Available