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Isotopes of the Element Holmium

[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

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
1406 millisecondsProton Emission100.00%
1414.1 millisecondsProton Emission100.00%
1420.4 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
> 0.00%
143No Data AvailableElectron Capture with
delayed Proton Emission (suspected)
No Data Available
Electron Capture (suspected)No Data Available
1440.7 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
No Data Available
1452.4 secondsElectron Capture100.00%
1463.6 secondsElectron Capture100.00%
1475.8 secondsElectron Capture100.00%
1482.2 secondsElectron Capture100.00%
148m9.59 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
148m12.35 millisecondsIsomeric Transition100.00%
14921.1 secondsElectron Capture100.00%
149m56 secondsElectron Capture100.00%
15072 secondsElectron Capture100.00%
150m24.1 secondsElectron Capture100.00%
No Data AvailableNo Data Available
15135.2 secondsElectron Capture78.00%
Alpha Decay22.00%
151m47.2 secondsAlpha Decay80.00%
Electron Capture20.00%
152161.8 secondsElectron Capture88.00%
Alpha Decay12.00%
152m50.0 secondsAlpha Decay10.80%
Electron Capture89.20%
1532.01 minutesElectron Capture99.95%
Alpha Decay0.05%
153m9.3 minutesElectron Capture99.82%
Alpha Decay0.18%
15411.76 minutesElectron Capture99.98%
Alpha Decay0.02%
154m3.10 minutesElectron Capture100.00%
Alpha Decay< 1.0×10-3 %
15548 minutesElectron Capture100.00%
155m0.88 millisecondsIsomeric Transition100.00%
15656 minutesElectron Capture100.00%
156m9.5 secondsIsomeric Transition100.00%
156m17.8 minutesElectron Capture75.00%
Isomeric Transition25.00%
15712.6 minutesElectron Capture100.00%
15811.3 minutesElectron Capture100.00%
158m28 minutesIsomeric Transition> 81.00%
Electron Capture< 19.00%
158m121.3 minutesElectron Capture>= 93.00%
Isomeric Transition<= 7.00%
15933.05 minutesElectron Capture100.00%
159m8.30 secondsIsomeric Transition100.00%
16025.6 minutesElectron Capture100.00%
160m5.02 hoursElectron Capture27.00%
Isomeric Transition73.00%
160m13 secondsIsomeric Transition100.00%
1612.48 hoursElectron Capture100.00%
161m6.76 secondsIsomeric Transition100.00%
16215.0 minutesElectron Capture100.00%
162m67.0 minutesIsomeric Transition62.00%
Electron Capture38.00%
1634570 yearsElectron Capture100.00%
163m1.09 secondsIsomeric Transition100.00%
16429 minutesElectron Capture60.00%
Beta-minus Decay40.00%
164m37.5 minutesIsomeric Transition100.00%
16626.824 hoursBeta-minus Decay100.00%
166m1.20×103 yearsBeta-minus Decay100.00%
1673.003 hoursBeta-minus Decay100.00%
1682.99 minutesBeta-minus Decay100.00%
168m132 secondsIsomeric Transition>= 99.50%
Beta-minus Decay<= 0.50%
1694.72 minutesBeta-minus Decay100.00%
1702.76 minutesBeta-minus Decay100.00%
170m43 secondsBeta-minus Decay100.00%
17153 secondsBeta-minus Decay100.00%
17225 secondsBeta-minus Decay100.00%
173No Data AvailableBeta-minus Decay (suspected)No Data Available
174No Data AvailableBeta-minus Decay (suspected)No Data Available
175No Data AvailableBeta-minus Decay (suspected)No Data Available