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Isotopes of the Element Tantalum

[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
1800.01201%> 1.2×10+15 years
1800.01201%1.2×10+15 years
18199.98799%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
1552.9 millisecondsProton Emission100.00%
156144 millisecondsElectron CaptureNo Data Available
Proton Emission100.00%
156m0.36 secondsElectron Capture95.80%
Proton Emission4.20%
15710.1 millisecondsAlpha Decay96.60%
Proton Emission3.40%
157m4.3 millisecondsAlpha Decay100.00%
157m11.7 millisecondsAlpha Decay100.00%
15855 millisecondsAlpha Decay~ 91.00%
Electron Capture~ 9.00%
158m36.7 millisecondsAlpha Decay95.00%
Electron Capture5.00%
1590.83 secondsElectron Capture66.00%
Alpha Decay34.00%
159m0.56 secondsAlpha Decay55.00%
Electron Capture45.00%
1601.55 secondsElectron Capture66.00%
Alpha Decay34.00%
160m1.7 secondsNo Data AvailableNo Data Available
161No Data AvailableElectron CaptureNo Data Available
Alpha DecayNo Data Available
161m3.08 secondsElectron CaptureNo Data Available
Alpha DecayNo Data Available
1623.57 secondsElectron Capture99.93%
Alpha Decay0.07%
16310.6 secondsElectron Capture~ 99.80%
Alpha Decay~ 0.20%
16414.2 secondsElectron Capture100.00%
16531.0 secondsElectron Capture100.00%
16634.4 secondsElectron Capture100.00%
16780 secondsElectron Capture100.00%
1682.0 minutesElectron Capture100.00%
1694.9 minutesElectron Capture100.00%
1706.76 minutesElectron Capture100.00%
17123.3 minutesElectron Capture100.00%
17236.8 minutesElectron Capture100.00%
1733.14 hoursElectron Capture100.00%
1741.14 hoursElectron Capture100.00%
17510.5 hoursElectron Capture100.00%
1768.09 hoursElectron Capture100.00%
17756.56 hoursElectron Capture100.00%
1789.31 minutesElectron Capture100.00%
178m2.36 hoursElectron Capture100.00%
178m158 millisecondsIsomeric Transition100.00%
178m2290 millisecondsIsomeric Transition100.00%
1791.82 yearsElectron Capture100.00%
179m9.0 millisecondsIsomeric Transition100.00%
179m154.1 millisecondsIsomeric Transition100.00%
1808.154 hoursElectron Capture86.00%
Beta-minus Decay14.00%
180m1.2×10+15 yearsElectron Capture (suspected)No Data Available
180m1> 1.2×10+15 yearsBeta-minus Decay (suspected)No Data Available
181STABLE--
182114.74 daysBeta-minus Decay100.00%
182m283 millisecondsIsomeric Transition100.00%
182m115.84 minutesIsomeric Transition100.00%
1835.1 daysBeta-minus Decay100.00%
1848.7 hoursBeta-minus Decay100.00%
18549.4 minutesBeta-minus Decay100.00%
185m> 1 millisecondsNo Data AvailableNo Data Available
18610.5 minutesBeta-minus Decay100.00%
186m1.54 minutesBeta-minus Decay100.00%
1872.3 minutesBeta-minus Decay100.00%
187m22 secondsBeta-minus Decay (suspected)No Data Available
Isomeric Transition (suspected)No Data Available
187m1> 5 minutesBeta-minus Decay (suspected)No Data Available
187m25 minutesIsomeric Transition (suspected)   No Data Available
18819.6 secondsBeta-minus DecayNo Data Available
1891.6 microsecondsBeta-minus Decay (suspected)No Data Available
1905.3 secondsBeta-minus Decay100.00%
191> 300 nanoseconds   Beta-minus Decay (suspected)No Data Available
1922.2 secondsBeta-minus Decay100.00%