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Isotopes of the Element Holmium

[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
165100%STABLE

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
0.08%
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%
165STABLE--
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 Available   Beta-minus Decay (suspected)No Data Available