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Isotopes of the Element Cerium

[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
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 years   Double 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