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Isotopes of the Element Gadolinium

[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
1520.20%1.08×1014 years
1542.18%STABLE
15514.80%STABLE
15620.47%STABLE
15715.65%STABLE
15824.84%STABLE
16021.86%> 3.1×10+19 years

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
133No Data AvailableNo Data AvailableNo Data Available
134No Data AvailableElectron Capture (suspected)No Data Available
1351.1 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
18.00%
136>= 200 nanoseconds   No Data AvailableNo Data Available
1372.2 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
No Data Available
1384.7 secondsElectron Capture100.00%
1395.8 secondsElectron Capture with
delayed Proton Emission
> 0.00%
Electron Capture> 0.00%
139m4.8 secondsElectron Capture> 0.00%
Electron Capture with
delayed Proton Emission
> 0.00%
14015.8 secondsElectron Capture100.00%
14114 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
0.03%
141m24.5 secondsElectron Capture89.00%
Isomeric Transition11.00%
14270.2 secondsElectron Capture100.00%
14339 secondsElectron Capture100.00%
143m110.0 secondsElectron Capture100.00%
1444.47 minutesElectron Capture100.00%
14523.0 minutesElectron Capture100.00%
145m85 secondsIsomeric Transition94.30%
Electron Capture5.70%
14648.27 daysElectron Capture100.00%
14738.06 hoursElectron Capture100.00%
14870.9 yearsAlpha Decay100.00%
1499.28 daysElectron Capture100.00%
Alpha Decay4.3×10-4 %
1501.79×10+6 yearsAlpha Decay100.00%
151123.9 daysElectron Capture100.00%
Alpha Decay~ 8.0×10-7 %
1521.08×1014 yearsAlpha Decay100.00%
153240.4 daysElectron Capture100.00%
154STABLE--
155STABLE--
155m31.97 millisecondsIsomeric Transition100.00%
156STABLE--
157STABLE--
158STABLE--
15918.479 hoursBeta-minus Decay100.00%
160> 3.1×10+19 yearsDouble Beta-minus DecayNo Data Available
1613.66 minutesBeta-minus Decay100.00%
1628.4 minutesBeta-minus Decay100.00%
16368 secondsBeta-minus Decay100.00%
16445 secondsBeta-minus Decay100.00%
16510.3 secondsBeta-minus Decay100.00%
1664.8 secondsBeta-minus Decay100.00%
167No Data AvailableBeta-minus Decay (suspected)No Data Available
168No Data AvailableBeta-minus Decay (suspected)No Data Available
169No Data AvailableBeta-minus Decay (suspected)   No Data Available