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Isotopes of the Element Lanthanum

[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
1380.08881%1.02×10+11 years
13999.9119%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
11723.5 millisecondsProton Emission93.90%
Electron Capture6.10%
117m10 millisecondsProton Emission97.40%
Electron Capture2.60%
118No Data AvailableElectron Capture (suspected)No Data Available
119No Data AvailableElectron Capture (suspected)No Data Available
1202.8 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
> 0.00%
1215.3 secondsElectron Capture100.00%
1228.6 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
No Data Available
12317 secondsElectron Capture100.00%
12429.21 secondsElectron Capture100.00%
124m21 secondsElectron Capture100.00%
12564.8 secondsElectron Capture100.00%
125m0.39 secondsNo Data AvailableNo Data Available
12654 secondsElectron Capture> 0.00%
126m< 50 secondsElectron CaptureNo Data Available
Isomeric TransitionNo Data Available
1275.1 minutesElectron Capture100.00%
127m3.7 minutesElectron Capture100.00%
Isomeric TransitionNo Data Available
1285.18 minutesElectron Capture100.00%
128m< 1.4 minutesElectron Capture100.00%
12911.6 minutesElectron Capture100.00%
129m0.56 secondsIsomeric Transition100.00%
1308.7 minutesElectron Capture100.00%
13159 minutesElectron Capture100.00%
1324.8 hoursElectron Capture100.00%
132m24.3 minutesIsomeric Transition76.00%
Electron Capture24.00%
1333.912 hoursElectron Capture100.00%
1346.45 minutesElectron Capture100.00%
13519.5 hoursElectron Capture100.00%
1369.87 minutesElectron Capture100.00%
136m114 millisecondsIsomeric Transition100.00%
1376×10+4 yearsElectron Capture100.00%
1381.02×10+11 yearsElectron Capture65.60%
Beta-minus Decay34.40%
139STABLE--
1401.67855 daysBeta-minus Decay100.00%
1413.92 hoursBeta-minus Decay100.00%
14291.1 minutesBeta-minus Decay100.00%
14314.2 minutesBeta-minus Decay100.00%
14440.8 secondsBeta-minus Decay100.00%
14524.8 secondsBeta-minus Decay100.00%
1466.27 secondsBeta-minus Decay100.00%
146m10.0 secondsBeta-minus Decay100.00%
1474.06 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
0.04%
1481.26 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
0.15%
1491.05 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
1.43%
1500.86 secondsBeta-minus Decay with
delayed Neutron Emission
2.70%
Beta-minus Decay100.00%
151> 300 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
152> 150 nanosecondsBeta-minus Decay100.00%
153> 100 nanosecondsBeta-minus Decay (suspected)No Data Available
154No Data AvailableBeta-minus Decay (suspected)No Data Available
155No Data AvailableBeta-minus Decay (suspected)No Data Available