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Isotopes of the Element Einsteinium

[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
240No Data AvailableAlpha Decay (suspected)No Data Available
Electron Capture (suspected)No Data Available
2418 secondsElectron CaptureNo Data Available
Alpha DecayNo Data Available
24217.8 secondsAlpha Decay57.00%
Electron Capture43.00%
24323 secondsAlpha Decay61.00%
Electron Capture39.00%
Spontaneous Fission< 1.00%
24437 secondsElectron Capture96.00%
Alpha Decay4.00%
2451.1 minutesElectron Capture60.00%
Alpha Decay40.00%
2467.5 minutesAlpha Decay9.90%
Electron Capture90.10%
2474.55 minutesElectron Capture~ 93.00%
Alpha Decay~ 7.00%
247m625 daysAlpha DecayNo Data Available
24827 minutesElectron Capture99.70%
Alpha Decay~ 0.25%
249102.2 minutesElectron Capture99.43%
Alpha Decay0.57%
2508.6 hoursElectron Capture> 97.00%
Alpha Decay< 3.00%
250m2.22 hoursElectron Capture<= 100.00%
25133 hoursElectron Capture99.50%
Alpha Decay0.50%
252471.7 daysAlpha Decay78.00%
Electron Capture22.00%
25320.47 daysSpontaneous Fission8.7×10-6 %
Alpha Decay100.00%
254275.7 daysAlpha Decay100.00%
Beta-minus Decay1.7×10-4 %
Spontaneous Fission< 3.0×10-6 %
254m39.3 hoursAlpha Decay0.32%
Electron Capture0.08%
Spontaneous Fission< 0.05%
Beta-minus Decay98.00%
Isomeric Transition< 3.00%
25539.8 daysBeta-minus Decay92.00%
Alpha Decay8.00%
Spontaneous Fission4.1×10-3 %
25625.4 minutesBeta-minus Decay100.00%
256m7.6 hoursBeta-minus Decay100.00%
2577.7 daysBeta-minus DecayNo Data Available
Spontaneous FissionNo Data Available
258No Data AvailableAlpha Decay (suspected)No Data Available
Electron Capture (suspected)No Data Available