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Isotopes of the Element Lutetium

[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
17597.401%STABLE
1762.599%3.76×10+10 years

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
15045 millisecondsProton Emission70.90%
Electron Capture29.10%
15180.6 millisecondsProton Emission63.40%
Electron Capture36.60%
1520.7 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
15.00%
1530.9 secondsAlpha Decay~ 70.00%
Electron Capture~ 30.00%
154No Data Available   No Data AvailableNo Data Available
154m1.12 secondsElectron Capture100.00%
15568 millisecondsAlpha Decay90.00%
Electron Capture10.00%
155m138 millisecondsAlpha Decay76.00%
Electron Capture24.00%
155m12.69 millisecondsAlpha Decay100.00%
156494 millisecondsAlpha Decay~ 95.00%
Electron Capture~ 5.00%
156m198 millisecondsAlpha Decay100.00%
1576.8 secondsAlpha Decay> 0.00%
157m4.79 secondsElectron Capture94.00%
Alpha Decay6.00%
15810.6 secondsElectron Capture99.09%
Alpha Decay0.91%
15912.1 secondsElectron Capture100.00%
Alpha Decay0.10%
16036.1 secondsElectron Capture100.00%
Alpha Decay<= 1.0×10-4 %
160m40 secondsElectron Capture<= 100.00%
Alpha DecayNo Data Available
16177 secondsElectron Capture100.00%
161m7.3 millisecondsIsomeric TransitionNo Data Available
1621.37 minutesElectron Capture<= 100.00%
162m1.9 minutesElectron Capture<= 100.00%
162m11.5 minutesElectron Capture<= 100.00%
1633.97 minutesElectron Capture100.00%
1643.14 minutesElectron Capture100.00%
16510.74 minutesElectron Capture100.00%
1662.65 minutesElectron Capture100.00%
166m1.41 minutesElectron Capture58.00%
Isomeric Transition42.00%
166m12.12 minutesElectron Capture> 80.00%
Isomeric Transition< 20.00%
16751.5 minutesElectron Capture100.00%
167m>= 1 minutesIsomeric TransitionNo Data Available
Electron CaptureNo Data Available
1685.5 minutesElectron Capture100.00%
168m6.7 minutesElectron Capture> 99.60%
Isomeric Transition< 0.80%
16934.06 hoursElectron Capture100.00%
169m160 secondsIsomeric Transition100.00%
1702.012 daysElectron Capture100.00%
170m0.67 secondsIsomeric Transition100.00%
1718.24 daysElectron Capture100.00%
171m79 secondsIsomeric Transition100.00%
1726.70 daysElectron Capture100.00%
172m3.7 minutesIsomeric Transition100.00%
1731.37 yearsElectron Capture100.00%
1743.31 yearsElectron Capture100.00%
174m142 daysIsomeric Transition99.38%
Electron Capture0.62%
175STABLE--
1763.76×10+10 yearsBeta-minus Decay100.00%
176m3.664 hoursBeta-minus Decay99.90%
Electron Capture0.09%
1776.647 daysBeta-minus Decay100.00%
177m160.44 daysIsomeric Transition21.40%
Beta-minus Decay78.60%
177m16 minutesBeta-minus Decay100.00%
Isomeric Transition (suspected)   No Data Available
17828.4 minutesBeta-minus Decay100.00%
178m23.1 minutesBeta-minus Decay100.00%
1794.59 hoursBeta-minus Decay100.00%
179m3.1 millisecondsIsomeric Transition100.00%
1805.7 minutesBeta-minus Decay100.00%
1813.5 minutesBeta-minus Decay100.00%
1822.0 minutesBeta-minus Decay100.00%
18358 secondsBeta-minus Decay100.00%
18419 secondsBeta-minus Decay100.00%