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Promethium

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Isotopes of the Element Samarium

[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

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 AvailableElectron 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