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Isotopes of the Element Samarium

[Click for Main Data]         Proton Emission     Neutron Emission     Electron Emission     Positron Emission

Most of the isotope data on this site has been obtained from the National Nuclear Data Center.

Naturally Occurring Isotopes

Mass NumberNatural AbundanceHalf-life
1443.07%STABLE
14714.99%1.060×1011 years
14811.24%7×10+15 years
14913.82%STABLE
1507.38%STABLE
15226.75%STABLE
15422.75%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
128No Data Available   Electron Capture (suspected)No Data Available
Proton Emission (suspected)No Data Available
1290.55 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
> 0.00%
130No Data AvailableElectron CaptureNo Data Available
1311.2 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
> 0.00%
1324.0 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
No Data Available
1332.89 secondsElectron Capture with
delayed Proton Emission
> 0.00%
Electron Capture100.00%
133m3.5 secondsElectron CaptureNo Data Available
Isomeric TransitionNo Data Available
Electron Capture with
delayed Proton Emission
No Data Available
1349.5 secondsElectron Capture100.00%
13510.3 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
0.02%
13647 secondsElectron Capture100.00%
13745 secondsElectron Capture100.00%
1383.1 minutesElectron Capture100.00%
1392.57 minutesElectron Capture100.00%
139m10.7 secondsIsomeric Transition93.70%
Electron Capture6.30%
14014.82 minutesElectron Capture100.00%
14110.2 minutesElectron Capture100.00%
141m22.6 minutesElectron Capture99.69%
Isomeric Transition0.31%
14272.49 minutesElectron Capture100.00%
1438.75 minutesElectron Capture100.00%
143m66 secondsIsomeric Transition99.76%
Electron Capture0.24%
143m130 millisecondsIsomeric Transition100.00%
144STABLE--
145340 daysElectron Capture100.00%
14610.3×10+7 yearsAlpha Decay100.00%
1471.060×1011 yearsAlpha Decay100.00%
1487×10+15 yearsAlpha Decay100.00%
149STABLE--
150STABLE--
15190 yearsBeta-minus Decay100.00%
152STABLE--
15346.284 hoursBeta-minus Decay100.00%
153m10.6 millisecondsIsomeric Transition100.00%
154STABLE--
15522.3 minutesBeta-minus Decay100.00%
1569.4 hoursBeta-minus Decay100.00%
1578.03 minutesBeta-minus Decay100.00%
1585.30 minutesBeta-minus Decay100.00%
15911.37 secondsBeta-minus Decay100.00%
1609.6 secondsBeta-minus Decay100.00%
1614.8 secondsBeta-minus Decay100.00%
1622.4 secondsBeta-minus Decay100.00%
163No Data AvailableBeta-minus Decay (suspected)No Data Available
164No Data AvailableBeta-minus Decay (suspected)No Data Available
165No Data AvailableBeta-minus Decay (suspected)   No Data Available