It's Elemental

Europium

Previous Element

(Europium)

The Periodic Table of Elements

Next Element

(Terbium)

Terbium

Isotopes of the Element Gadolinium

[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
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 nanosecondsNo 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