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Isotopes of the Element Hafnium

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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
1740.16%2.0×10+15 years
1765.26%STABLE
17718.60%STABLE
17827.28%STABLE
17913.62%STABLE
18035.08%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
15360 nanosecondsElectron Capture (suspected)No Data Available
1542 secondsElectron Capture100.00%
Alpha Decay (suspected)No Data Available
1550.84 secondsElectron Capture100.00%
15623 millisecondsAlpha Decay100.00%
156m0.52 millisecondsAlpha Decay100.00%
157110 millisecondsAlpha Decay86.00%
Electron Capture14.00%
1582.85 secondsAlpha Decay44.30%
Electron Capture55.70%
1595.6 secondsElectron Capture65.00%
Alpha Decay35.00%
16013.6 secondsElectron Capture99.30%
Alpha Decay0.70%
16118.2 secondsElectron Capture> 99.87%
Alpha Decay< 0.13%
16239.4 secondsElectron Capture99.99%
Alpha Decay8.0×10-3 %
16340.0 secondsElectron Capture100.00%
Alpha Decay< 1.0×10-4 %
164111 secondsElectron Capture100.00%
16576 secondsElectron Capture100.00%
1666.77 minutesElectron Capture100.00%
1672.05 minutesElectron Capture100.00%
16825.95 minutesElectron Capture100.00%
1693.24 minutesElectron Capture100.00%
17016.01 hoursElectron Capture100.00%
17112.1 hoursElectron Capture100.00%
171m29.5 secondsIsomeric Transition<= 100.00%
Electron CaptureNo Data Available
1721.87 yearsElectron Capture100.00%
17323.6 hoursElectron Capture100.00%
1742.0×10+15 yearsAlpha Decay100.00%
17570 daysElectron Capture100.00%
176STABLE--
177STABLE--
177m1.09 secondsIsomeric Transition100.00%
177m151.4 minutesIsomeric Transition100.00%
178STABLE--
178m4.0 secondsIsomeric Transition100.00%
178m131 yearsIsomeric Transition100.00%
179STABLE--
179m18.67 secondsIsomeric Transition100.00%
179m125.05 daysIsomeric Transition100.00%
180STABLE--
180m5.47 hoursIsomeric Transition99.70%
Beta-minus Decay0.30%
18142.39 daysBeta-minus Decay100.00%
181m1.5 millisecondsIsomeric Transition100.00%
1828.90×10+6 yearsBeta-minus Decay100.00%
182m61.5 minutesBeta-minus Decay54.00%
Isomeric Transition46.00%
1831.018 hoursBeta-minus Decay100.00%
1844.12 hoursBeta-minus Decay100.00%
184m48 secondsIsomeric Transition100.00%
1853.5 minutesBeta-minus Decay100.00%
1862.6 minutesBeta-minus Decay100.00%
1870.27 microsecondsBeta-minus Decay100.00%
188No Data AvailableBeta-minus DecayNo Data Available
189No Data AvailableNo Data AvailableNo Data Available