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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.

All Known Isotopes of the Element Americium

Mass NumberHalf-lifeDecay ModeBranching Percentage
231≈ 10 secondsElectron CaptureNo Data Available
Alpha DecayNo Data Available
23279 secondsElectron Capture~ 98.00
Alpha Decay~ 2.00
233≈ 2 minutesElectron CaptureNo Data Available
Alpha DecayNo Data Available
2342.32 minutesElectron Capture99.96
Alpha Decay0.04
2359.9 minutesNo Data AvailableNo Data Available
2364.4 minutesElectron CaptureNo Data Available
23773.0 minutesElectron Capture99.98
Alpha Decay0.03
23898 minutesElectron Capture> 99.99
Alpha Decay1.0E-4
23911.9 hoursElectron Capture99.99
Alpha Decay0.01
24050.8 hoursElectron Capture100.00
Alpha Decay1.9E-4
241432.2 yearsAlpha Decay100.00
Spontaneous Fission4E-10
24216.02 hoursBeta-minus Decay82.70
Electron Capture17.30
242m141 yearsIsomeric Transition99.55
Alpha Decay0.45
Spontaneous Fission< 4.7E-9
242m214.0 millisecondsSpontaneous Fission~ 100.00
Alpha Decay< 5.0E-3
Isomeric TransitionNo Data Available
2437370 yearsAlpha Decay100.00
Spontaneous Fission3.7E-9
24410.1 hoursBeta-minus Decay100.00
244m≈ 26 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
246m273 microsecondsSpontaneous Fission<= 100.00
24723.0 minutesBeta-minus Decay100.00
248≈ 10 minutesBeta-minus Decay100.00
249≈ 2 minutesBeta-minus DecayNo Data Available