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Isotopes of the Element Curium

[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

Curium has no naturally occurring isotopes.

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
23323 secondsElectron Capture80.00%
Alpha Decay20.00%
23451 secondsAlpha Decay~ 40.00%
Spontaneous Fission~ 40.00%
Electron Capture~ 20.00%
235No Data AvailableAlpha Decay (suspected)No Data Available
Electron Capture (suspected)No Data Available
236No Data AvailableElectron CaptureNo Data Available
Alpha DecayNo Data Available
237No Data AvailableElectron Capture100.00%
Alpha Decay< 1.00%
2382.4 hoursElectron Capture>= 90.00%
Alpha Decay<= 10.00%
239≈ 2.9 hoursElectron Capture100.00%
Alpha Decay< 0.10%
24027 daysAlpha Decay> 99.50%
Electron Capture< 0.50%
Spontaneous Fission3.9×10-6 %
24132.8 daysElectron Capture99.00%
Alpha Decay1.00%
242162.8 daysAlpha Decay100.00%
Spontaneous Fission6.2×10-6 %
Emission of a silicon-34 nucleus1×10-14 %
24329.1 yearsAlpha Decay99.71%
Electron Capture0.29%
Spontaneous Fission5.3×10-9 %
24418.1 yearsSpontaneous Fission1.4×10-4 %
Alpha Decay100.00%
244m34 millisecondsIsomeric Transition100.00%
2458423 yearsAlpha Decay100.00%
Spontaneous Fission6.1×10-7 %
2464706 yearsAlpha Decay99.97%
Spontaneous Fission0.03%
2471.56×10+7 yearsAlpha Decay100.00%
2483.48×10+5 yearsAlpha Decay91.61%
Spontaneous Fission8.39%
24964.15 minutesBeta-minus Decay100.00%
250≈ 8.3×10+3 yearsSpontaneous Fission~ 74.00%
Alpha Decay~ 18.00%
Beta-minus Decay~ 8.00%
25116.8 minutesBeta-minus Decay100.00%
252< 2 daysNo Data AvailableNo Data Available