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It's Elemental

Isotopes of the Element Promethium

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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
126No Data AvailableElectron Capture (suspected)No Data Available
127No Data AvailableProton Emission (suspected)No Data Available
Electron Capture (suspected)No Data Available
1281.0 secondsElectron Capture100.00%
Alpha DecayNo Data Available
Electron Capture with
delayed Proton Emission
No Data Available
1292.4 secondsElectron Capture100.00%
1302.6 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
No Data Available
1316.3 secondsElectron Capture100.00%
1326.2 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
~ 5.0×10-5 %
13313.5 secondsElectron Capture100.00%
133m< 8.8 secondsIsomeric TransitionNo Data Available
Electron CaptureNo Data Available
134≈ 5 secondsElectron Capture100.00%
134m22 secondsElectron Capture100.00%
13549 secondsElectron Capture100.00%
135m45 secondsElectron Capture100.00%
136107 secondsElectron Capture100.00%
136m47 secondsElectron Capture100.00%
1372.4 minutesElectron Capture100.00%
13810 secondsElectron Capture100.00%
138m3.24 minutesElectron CaptureNo Data Available
1394.15 minutesElectron Capture100.00%
139m180 millisecondsIsomeric Transition99.94%
Electron Capture0.06%
1409.2 secondsElectron Capture100.00%
140m5.95 minutesElectron Capture100.00%
14120.90 minutesElectron Capture100.00%
14240.5 secondsElectron Capture100.00%
142m2.0 millisecondsIsomeric Transition100.00%
143265 daysElectron Capture100.00%
144363 daysElectron Capture100.00%
14517.7 yearsElectron Capture100.00%
Alpha Decay2.8×10-7 %
1465.53 yearsElectron Capture66.00%
Beta-minus Decay34.00%
1472.6234 yearsBeta-minus Decay100.00%
1485.368 daysBeta-minus Decay100.00%
148m41.29 daysBeta-minus Decay95.80%
Isomeric Transition4.20%
14953.08 hoursBeta-minus Decay100.00%
1502.68 hoursBeta-minus Decay100.00%
15128.40 hoursBeta-minus Decay100.00%
1524.12 minutesBeta-minus Decay100.00%
152m13.8 minutesBeta-minus Decay100.00%
Isomeric Transition>= 0.00%
152m17.52 minutesBeta-minus Decay100.00%
1535.25 minutesBeta-minus Decay100.00%
1542.68 minutesBeta-minus Decay100.00%
154m1.73 minutesBeta-minus Decay100.00%
15541.5 secondsBeta-minus Decay100.00%
15626.70 secondsBeta-minus Decay100.00%
15710.56 secondsBeta-minus Decay100.00%
1584.8 secondsBeta-minus Decay100.00%
1591.5 secondsBeta-minus Decay100.00%
160No Data AvailableBeta-minus Decay (suspected)No Data Available
161No Data AvailableBeta-minus Decay (suspected)No Data Available
162No Data AvailableBeta-minus Decay (suspected)No Data Available
163No Data AvailableBeta-minus Decay (suspected)No Data Available

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For questions about this page, please contact Carol McKisson.