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Isotopes of the Element Thulium

[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
169100%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
1441.9 microsecondsProton Emission> 0.00%
1453.17 microsecondsProton Emission100.00%
14680 millisecondsElectron CaptureNo Data Available
Proton EmissionNo Data Available
146m200 millisecondsProton EmissionNo Data Available
Electron CaptureNo Data Available
1470.58 secondsElectron Capture85.00%
Proton Emission15.00%
147m0.36 millisecondsProton Emission100.00%
1480.7 secondsElectron Capture100.00%
1490.9 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
0.20%
1502.20 secondsElectron Capture100.00%
150m5.2 millisecondsIsomeric Transition100.00%
1514.17 secondsElectron Capture100.00%
151m6.6 secondsElectron Capture100.00%
1528.0 secondsElectron Capture100.00%
152m5.2 secondsElectron Capture100.00%
1531.48 secondsAlpha Decay91.00%
Electron Capture9.00%
153m2.5 secondsAlpha Decay92.00%
Electron Capture8.00%
1548.1 secondsAlpha Decay54.00%
Electron Capture46.00%
154m3.30 secondsElectron Capture42.00%
Isomeric TransitionNo Data Available
Alpha Decay58.00%
15521.6 secondsElectron Capture99.11%
Alpha Decay0.89%
155m45 secondsElectron Capture> 98.00%
Alpha Decay< 2.00%
15683.8 secondsElectron Capture99.94%
Alpha Decay0.06%
1573.63 minutesElectron Capture100.00%
1583.98 minutesElectron Capture100.00%
158m20 secondsElectron Capture (suspected)No Data Available
1599.13 minutesElectron Capture100.00%
1609.4 minutesElectron Capture100.00%
160m74.5 secondsIsomeric Transition85.00%
Electron Capture15.00%
16130.2 minutesElectron Capture100.00%
16221.70 minutesElectron Capture100.00%
162m24.3 secondsIsomeric Transition81.00%
Electron Capture19.00%
1631.810 hoursElectron Capture100.00%
1642.0 minutesElectron Capture100.00%
164m5.1 minutesIsomeric Transition~ 80.00%
Electron Capture~ 20.00%
16530.06 hoursElectron Capture100.00%
1667.70 hoursElectron Capture100.00%
166m340 millisecondsIsomeric Transition100.00%
1679.25 daysElectron Capture100.00%
16893.1 daysElectron Capture99.99%
Beta-minus Decay0.01%
169STABLE--
170128.6 daysBeta-minus Decay99.87%
Electron Capture0.13%
1711.92 yearsBeta-minus Decay100.00%
17263.6 hoursBeta-minus Decay100.00%
1738.24 hoursBeta-minus Decay100.00%
1745.4 minutesBeta-minus Decay100.00%
174m2.29 secondsIsomeric Transition99.00%
Beta-minus Decay< 1.00%
17515.2 minutesBeta-minus Decay100.00%
1761.9 minutesBeta-minus Decay100.00%
17790 secondsBeta-minus Decay100.00%
178> 300 nanosecondsBeta-minus DecayNo Data Available
179No Data AvailableBeta-minus Decay (suspected)No Data Available