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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.

Naturally Occurring Isotopes

Einsteinium has no naturally occurring isotopes.

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