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Lanthanum

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Isotopes of the Element Cerium

[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
1360.185%> 0.7×10+14 years
1380.251%>= 0.9×10+14 years
14088.450%STABLE
14211.114%> 5×10+16 years

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
119No Data AvailableElectron Capture (suspected)No Data Available
120No Data AvailableElectron Capture (suspected)No Data Available
1211.1 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
~ 1.00%
122No Data AvailableElectron CaptureNo Data Available
Electron Capture with
delayed Proton Emission
No Data Available
1233.8 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
> 0.00%
1246 secondsElectron Capture100.00%
1259.7 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
No Data Available
12651.0 secondsElectron Capture100.00%
12734 secondsElectron Capture100.00%
127m28.6 secondsElectron Capture100.00%
1283.93 minutesElectron Capture100.00%
1293.5 minutesElectron Capture> 0.00%
13022.9 minutesElectron Capture100.00%
13110.3 minutesElectron Capture100.00%
131m5.4 minutesElectron Capture100.00%
Isomeric TransitionNo Data Available
1323.51 hoursElectron Capture100.00%
132m9.4 millisecondsIsomeric Transition100.00%
13397 minutesElectron Capture100.00%
133m5.1 hoursElectron CaptureNo Data Available
Isomeric TransitionNo Data Available
1343.16 daysElectron Capture100.00%
13517.7 hoursElectron Capture100.00%
135m20 secondsIsomeric Transition100.00%
136> 0.7×10+14 yearsDouble Electron CaptureNo Data Available
1379.0 hoursElectron Capture100.00%
137m34.4 hoursIsomeric Transition99.21%
Electron Capture0.79%
138>= 0.9×10+14 yearsDouble Electron Capture100.00%
138m8.65 millisecondsIsomeric Transition100.00%
139137.641 daysElectron Capture100.00%
139m54.8 secondsIsomeric Transition100.00%
140STABLE--
14132.508 daysBeta-minus Decay100.00%
142> 5×10+16 yearsDouble Beta-minus DecayNo Data Available
14333.039 hoursBeta-minus Decay100.00%
144284.91 daysBeta-minus Decay100.00%
1453.01 minutesBeta-minus Decay100.00%
14613.52 minutesBeta-minus Decay100.00%
14756.4 secondsBeta-minus Decay100.00%
14856 secondsBeta-minus Decay100.00%
1495.3 secondsBeta-minus Decay100.00%
1504.0 secondsBeta-minus Decay100.00%
1511.76 secondsBeta-minus Decay100.00%
151m1.02 secondsBeta-minus DecayNo Data Available
1521.4 secondsBeta-minus Decay100.00%
153> 100 nanosecondsBeta-minus Decay (suspected)No Data Available
154> 100 nanosecondsBeta-minus Decay100.00%
155> 300 nanosecondsBeta-minus Decay (suspected)No Data Available
156No Data AvailableBeta-minus Decay (suspected)No Data Available
157No Data AvailableBeta-minus Decay (suspected)No Data Available