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Gadolinium

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Isotopes of the Element Terbium

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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
159100%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
1350.94 millisecondsProton Emission100.00%
136No Data AvailableElectron Capture (suspected)No Data Available
137No Data AvailableElectron Capture (suspected)No Data Available
Proton Emission (suspected)No Data Available
138>= 200 nanosecondsElectron Capture100.00%
Proton EmissionNo Data Available
1391.6 secondsElectron CaptureNo Data Available
Electron Capture with
delayed Proton Emission (suspected)
No Data Available
1402.0 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
0.26%
1413.5 secondsElectron Capture100.00%
141m7.9 secondsElectron Capture100.00%
142597 millisecondsElectron Capture with
delayed Proton Emission
2.2×10-3 %
Electron Capture100.00%
142m303 millisecondsIsomeric Transition100.00%
14312 secondsElectron Capture100.00%
143m< 21 secondsElectron CaptureNo Data Available
144≈ 1 secondsElectron Capture100.00%
144m4.25 secondsIsomeric Transition66.00%
Electron Capture34.00%
145No Data AvailableElectron Capture (suspected)No Data Available
145m30.9 secondsElectron Capture100.00%
1468 secondsElectron Capture100.00%
146m23 secondsElectron Capture100.00%
146m11.18 millisecondsIsomeric Transition100.00%
1471.64 hoursElectron Capture100.00%
147m1.83 minutesElectron Capture100.00%
14860 minutesElectron Capture100.00%
148m2.20 minutesElectron Capture100.00%
1494.118 hoursElectron Capture83.30%
Alpha Decay16.70%
149m4.16 minutesElectron Capture99.98%
Alpha Decay0.02%
1503.48 hoursElectron Capture100.00%
Alpha Decay< 0.05%
150m5.8 minutesElectron CaptureNo Data Available
15117.609 hoursElectron Capture99.99%
Alpha Decay9.5×10-3 %
151m25 secondsIsomeric Transition93.40%
Electron Capture6.60%
15217.5 hoursElectron Capture100.00%
Alpha Decay< 7.0×10-7 %
152m4.2 minutesIsomeric Transition78.80%
Electron Capture21.20%
1532.34 daysElectron Capture100.00%
15421.5 hoursElectron Capture100.00%
Beta-minus Decay< 0.10%
154m22.7 hoursElectron Capture98.20%
Isomeric Transition1.80%
154m19.4 hoursElectron Capture78.20%
Isomeric Transition21.80%
Beta-minus Decay< 0.10%
1555.32 daysElectron Capture100.00%
1565.35 daysElectron Capture100.00%
156m24.4 hoursIsomeric Transition100.00%
156m15.3 hoursElectron Capture> 0.00%
Isomeric Transition< 100.00%
15771 yearsElectron Capture100.00%
158180 yearsElectron Capture83.40%
Beta-minus Decay16.60%
158m10.70 secondsIsomeric Transition100.00%
Beta-minus Decay< 0.60%
Electron Capture< 0.01%
158m10.40 millisecondsIsomeric Transition100.00%
159STABLE--
16072.3 daysBeta-minus Decay100.00%
1616.89 daysBeta-minus Decay100.00%
1627.60 minutesBeta-minus Decay100.00%
16319.5 minutesBeta-minus Decay100.00%
1643.0 minutesBeta-minus Decay100.00%
1652.11 minutesBeta-minus Decay100.00%
16625.1 secondsBeta-minus Decay100.00%
16719.4 secondsBeta-minus Decay100.00%
1688.2 secondsBeta-minus Decay100.00%
169No Data AvailableBeta-minus Decay (suspected)No Data Available
170No Data AvailableBeta-minus Decay (suspected)No Data Available
171No Data AvailableBeta-minus Decay (suspected)No Data Available