Isotopes of hafnium

Natural hafnium (72Hf) consists of five observationally stable isotopes (176Hf, 177Hf, 178Hf, 179Hf, and 180Hf) and one very long-lived radioisotope, 174Hf, with a half-life of $7$ years. In addition, there are 34 known synthetic radioisotopes, the most stable of which is 182Hf with a half-life of $8,900,000$ years. This extinct radionuclide is used in hafnium–tungsten dating to study the chronology of planetary differentiation.

No other radioisotope has a half-life over 1.87 years. Most isotopes have half-lives under 1 minute. There are also at least 27 nuclear isomers, the most stable of which is 178m2Hf with a half-life of 31 years. All isotopes of hafnium are either radioactive or observationally stable, meaning that they are predicted to be radioactive but no actual decay has been observed.

List of isotopes

 * -174
 * 153Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 81
 * 152.97069(54)#
 * 400# ms [>200 ns]
 * 1/2+#
 * style="text-indent:1em" | 153mHf
 * colspan="3" style="text-indent:2em" | 750(100)# keV
 * 500# ms
 * 11/2−#
 * rowspan=2|154Hf
 * rowspan=2 style="text-align:right" | 72
 * rowspan=2 style="text-align:right" | 82
 * rowspan=2|153.96486(54)#
 * rowspan=2|2(1) s
 * β+
 * 154Lu
 * rowspan=2|0+
 * rowspan=2|
 * rowspan=2|
 * α (rare)
 * 150Yb
 * rowspan=2|155Hf
 * rowspan=2 style="text-align:right" | 72
 * rowspan=2 style="text-align:right" | 83
 * rowspan=2|154.96339(43)#
 * rowspan=2|890(120) ms
 * β+
 * 155Lu
 * rowspan=2|7/2−#
 * rowspan=2|
 * rowspan=2|
 * α (rare)
 * 151Yb
 * rowspan=2|156Hf
 * rowspan=2 style="text-align:right" | 72
 * rowspan=2 style="text-align:right" | 84
 * rowspan=2|155.95936(22)
 * rowspan=2|23(1) ms
 * α (97%)
 * 152Yb
 * rowspan=2|0+
 * rowspan=2|
 * rowspan=2|
 * β+ (3%)
 * 156Lu
 * style="text-indent:1em" | 156mHf
 * colspan="3" style="text-indent:2em" | 1959.0(10) keV
 * 480(40) μs
 * 8+
 * rowspan=2|157Hf
 * rowspan=2 style="text-align:right" | 72
 * rowspan=2 style="text-align:right" | 85
 * rowspan=2|156.95840(21)#
 * rowspan=2|115(1) ms
 * α (86%)
 * 153Yb
 * rowspan=2|7/2−
 * rowspan=2|
 * rowspan=2|
 * β+ (14%)
 * 157Lu
 * rowspan=2|158Hf
 * rowspan=2 style="text-align:right" | 72
 * rowspan=2 style="text-align:right" | 86
 * rowspan=2|157.954799(19)
 * rowspan=2|2.84(7) s
 * β+ (55%)
 * 158Lu
 * rowspan=2|0+
 * rowspan=2|
 * rowspan=2|
 * α (45%)
 * 154Yb
 * rowspan=2|159Hf
 * rowspan=2 style="text-align:right" | 72
 * rowspan=2 style="text-align:right" | 87
 * rowspan=2|158.953995(18)
 * rowspan=2|5.20(10) s
 * β+ (59%)
 * 159Lu
 * rowspan=2|7/2−#
 * rowspan=2|
 * rowspan=2|
 * α (41%)
 * 155Yb
 * rowspan=2|160Hf
 * rowspan=2 style="text-align:right" | 72
 * rowspan=2 style="text-align:right" | 88
 * rowspan=2|159.950684(12)
 * rowspan=2|13.6(2) s
 * β+ (99.3%)
 * 160Lu
 * rowspan=2|0+
 * rowspan=2|
 * rowspan=2|
 * α (.7%)
 * 156Yb
 * rowspan=2|161Hf
 * rowspan=2 style="text-align:right" | 72
 * rowspan=2 style="text-align:right" | 89
 * rowspan=2|160.950275(24)
 * rowspan=2|18.2(5) s
 * β+ (99.7%)
 * 161Lu
 * rowspan=2|3/2−#
 * rowspan=2|
 * rowspan=2|
 * α (.3%)
 * 157Yb
 * rowspan=2|162Hf
 * rowspan=2 style="text-align:right" | 72
 * rowspan=2 style="text-align:right" | 90
 * rowspan=2|161.94721(1)
 * rowspan=2|39.4(9) s
 * β+ (99.99%)
 * 162Lu
 * rowspan=2|0+
 * rowspan=2|
 * rowspan=2|
 * α (.008%)
 * 158Yb
 * rowspan=2|163Hf
 * rowspan=2 style="text-align:right" | 72
 * rowspan=2 style="text-align:right" | 91
 * rowspan=2|162.94709(3)
 * rowspan=2|40.0(6) s
 * β+
 * 163Lu
 * rowspan=2|3/2−#
 * rowspan=2|
 * rowspan=2|
 * α (10−4%)
 * 159Yb
 * 164Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 92
 * 163.944367(22)
 * 111(8) s
 * β+
 * 164Lu
 * 0+
 * 165Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 93
 * 164.94457(3)
 * 76(4) s
 * β+
 * 165Lu
 * (5/2−)
 * 166Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 94
 * 165.94218(3)
 * 6.77(30) min
 * β+
 * 166Lu
 * 0+
 * 167Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 95
 * 166.94260(3)
 * 2.05(5) min
 * β+
 * 167Lu
 * (5/2)−
 * 168Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 96
 * 167.94057(3)
 * 25.95(20) min
 * β+
 * 168Lu
 * 0+
 * 169Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 97
 * 168.94126(3)
 * 3.24(4) min
 * β+
 * 169Lu
 * (5/2)−
 * 170Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 98
 * 169.93961(3)
 * 16.01(13) h
 * EC
 * 170Lu
 * 0+
 * 171Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 99
 * 170.94049(3)
 * 12.1(4) h
 * β+
 * 171Lu
 * 7/2(+)
 * style="text-indent:1em" | 171mHf
 * colspan="3" style="text-indent:2em" | 21.93(9) keV
 * 29.5(9) s
 * IT
 * 171Hf
 * 1/2(−)
 * 172Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 100
 * 171.939448(26)
 * 1.87(3) y
 * EC
 * 172Lu
 * 0+
 * style="text-indent:1em" | 172mHf
 * colspan="3" style="text-indent:2em" | 2005.58(11) keV
 * 163(3) ns
 * (8−)
 * 173Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 101
 * 172.94051(3)
 * 23.6(1) h
 * β+
 * 173Lu
 * 1/2−
 * 174Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 102
 * 173.940046(3)
 * 7.0(12)×1016 y
 * α
 * 170Yb
 * 0+
 * 0.0016(1)
 * 0.001619–0.001621
 * style="text-indent:1em" | 174m1Hf
 * colspan="3" style="text-indent:2em" | 1549.3 keV
 * 138(4) ns
 * (6+)
 * style="text-indent:1em" | 174m2Hf
 * colspan="3" style="text-indent:2em" | 1797.5(20) keV
 * 2.39(4) μs
 * (8−)
 * style="text-indent:1em" | 174m3Hf
 * colspan="3" style="text-indent:2em" | 3311.7 keV
 * 3.7(2) μs
 * (14+)
 * 175Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 103
 * 174.941509(3)
 * 70(2) d
 * β+
 * 175Lu
 * 5/2−
 * 176Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 104
 * 175.9414086(24)
 * colspan=3 align=center|Observationally Stable
 * 0+
 * 0.0526(7)
 * 0.05206–0.05271
 * style="text-indent:1em" | 176m1Hf
 * colspan="3" style="text-indent:2em" | 1333.07(7) keV
 * 9.6(3) μs
 * IT
 * 176Hf
 * 6+
 * style="text-indent:1em" | 176m2Hf
 * colspan="3" style="text-indent:2em" | 1559.31(9) keV
 * 9.9(2) μs
 * IT
 * 176Hf
 * 8−
 * style="text-indent:1em" | 176m3Hf
 * colspan="3" style="text-indent:2em" | 2865.8(7) keV
 * 401(6) μs
 * IT
 * 176Hf
 * 14−
 * style="text-indent:1em" | 176m4Hf
 * colspan="3" style="text-indent:2em" | 4863.6(9) keV
 * 43(4) μs
 * IT
 * 176Hf
 * 22−
 * 177Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 105
 * 176.9432207(23)
 * colspan=3 align=center|Observationally Stable
 * 7/2−
 * 0.1860(9)
 * 0.18593–0.18606
 * style="text-indent:1em" | 177m1Hf
 * colspan="3" style="text-indent:2em" | 1315.4504(8) keV
 * 1.09(5) s
 * 23/2+
 * style="text-indent:1em" | 177m2Hf
 * colspan="3" style="text-indent:2em" | 1342.38(20) keV
 * 55.9(12) μs
 * (19/2−)
 * style="text-indent:1em" | 177m3Hf
 * colspan="3" style="text-indent:2em" | 2740.02(15) keV
 * 51.4(5) min
 * 37/2−
 * 178Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 106
 * 177.9436988(23)
 * colspan=3 align=center|Observationally Stable
 * 0+
 * 0.2728(7)
 * 0.27278–0.27297
 * style="text-indent:1em" | 178m1Hf
 * colspan="3" style="text-indent:2em" | 1147.423(5) keV
 * 4.0(2) s
 * 8−
 * style="text-indent:1em" | 178m2Hf
 * colspan="3" style="text-indent:2em" | 2445.69(11) keV
 * 31(1) y
 * 16+
 * style="text-indent:1em" | 178m3Hf
 * colspan="3" style="text-indent:2em" | 2573.5(5) keV
 * 68(2) μs
 * (14−)
 * 179Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 107
 * 178.9458161(23)
 * colspan=3 align=center|Observationally Stable
 * 9/2+
 * 0.1362(2)
 * 0.13619–0.1363
 * style="text-indent:1em" | 179m1Hf
 * colspan="3" style="text-indent:2em" | 375.0367(25) keV
 * 18.67(4) s
 * 1/2−
 * style="text-indent:1em" | 179m2Hf
 * colspan="3" style="text-indent:2em" | 1105.84(19) keV
 * 25.05(25) d
 * 25/2−
 * 180Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 108
 * 179.9465500(23)
 * colspan=3 align=center|Observationally Stable
 * 0+
 * 0.3508(16)
 * 0.35076–0.351
 * style="text-indent:1em" | 180m1Hf
 * colspan="3" style="text-indent:2em" | 1141.48(4) keV
 * 5.47(4) h
 * 8−
 * style="text-indent:1em" | 180m2Hf
 * colspan="3" style="text-indent:2em" | 1374.15(4) keV
 * 0.57(2) μs
 * (4−)
 * style="text-indent:1em" | 180m3Hf
 * colspan="3" style="text-indent:2em" | 2425.8(10) keV
 * 15(5) μs
 * (10+)
 * style="text-indent:1em" | 180m4Hf
 * colspan="3" style="text-indent:2em" | 2486.3(9) keV
 * 10(1) μs
 * 12+
 * style="text-indent:1em" | 180m5Hf
 * colspan="3" style="text-indent:2em" | 2538.3(12) keV
 * >10 μs
 * (14+)
 * style="text-indent:1em" | 180m6Hf
 * colspan="3" style="text-indent:2em" | 3599.3(18) keV
 * 90(10) μs
 * (18−)
 * 181Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 109
 * 180.9491012(23)
 * 42.39(6) d
 * β−
 * 181Ta
 * 1/2−
 * style="text-indent:1em" | 181m1Hf
 * colspan="3" style="text-indent:2em" | 595(3) keV
 * 80(5) μs
 * (9/2+)
 * style="text-indent:1em" | 181m2Hf
 * colspan="3" style="text-indent:2em" | 1040(10) keV
 * ~100 μs
 * (17/2+)
 * style="text-indent:1em" | 181m3Hf
 * colspan="3" style="text-indent:2em" | 1738(10) keV
 * 1.5(5) ms
 * (27/2−)
 * 182Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 110
 * 181.950554(7)
 * 8.90(9)×106 y
 * β−
 * 182Ta
 * 0+
 * rowspan=2 style="text-indent:1em" | 182mHf
 * rowspan=2 colspan="3" style="text-indent:2em" | 1172.88(18) keV
 * rowspan=2|61.5(15) min
 * β− (58%)
 * 182Ta
 * rowspan=2|8−
 * rowspan=2|
 * rowspan=2|
 * IT (42%)
 * 182Hf
 * 183Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 111
 * 182.95353(3)
 * 1.067(17) h
 * β−
 * 183Ta
 * (3/2−)
 * 184Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 112
 * 183.95545(4)
 * 4.12(5) h
 * β−
 * 184Ta
 * 0+
 * style="text-indent:1em" | 184mHf
 * colspan="3" style="text-indent:2em" | 1272.4(4) keV
 * 48(10) s
 * β−
 * 184Ta
 * 8−
 * 185Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 113
 * 184.95882(21)#
 * 3.5(6) min
 * β−
 * 185Ta
 * 3/2−#
 * 186Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 114
 * 185.96089(32)#
 * 2.6(12) min
 * β−
 * 186Ta
 * 0+
 * 187Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 115
 * 186.96457(22)#
 * 14# s [>300 ns]
 * 9/2−#
 * style="text-indent:1em" | 187mHf
 * colspan="3" style="text-indent:2em" |500(300)# keV
 * 270(80) ns
 * IT
 * 187Hf
 * 3/2−#
 * 188Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 116
 * 187.96690(32)#
 * 20# s [>300 ns]
 * 0+
 * 189Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 117
 * 188.97085(32)#
 * 400# ms [>300 ns]
 * 3/2−#
 * 190Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 118
 * 189.97338(43)#
 * 600# ms [>300 ns]
 * 0+
 * 191Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 119
 * 192Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 120
 * 0+
 * 180Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 108
 * 179.9465500(23)
 * colspan=3 align=center|Observationally Stable
 * 0+
 * 0.3508(16)
 * 0.35076–0.351
 * style="text-indent:1em" | 180m1Hf
 * colspan="3" style="text-indent:2em" | 1141.48(4) keV
 * 5.47(4) h
 * 8−
 * style="text-indent:1em" | 180m2Hf
 * colspan="3" style="text-indent:2em" | 1374.15(4) keV
 * 0.57(2) μs
 * (4−)
 * style="text-indent:1em" | 180m3Hf
 * colspan="3" style="text-indent:2em" | 2425.8(10) keV
 * 15(5) μs
 * (10+)
 * style="text-indent:1em" | 180m4Hf
 * colspan="3" style="text-indent:2em" | 2486.3(9) keV
 * 10(1) μs
 * 12+
 * style="text-indent:1em" | 180m5Hf
 * colspan="3" style="text-indent:2em" | 2538.3(12) keV
 * >10 μs
 * (14+)
 * style="text-indent:1em" | 180m6Hf
 * colspan="3" style="text-indent:2em" | 3599.3(18) keV
 * 90(10) μs
 * (18−)
 * 181Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 109
 * 180.9491012(23)
 * 42.39(6) d
 * β−
 * 181Ta
 * 1/2−
 * style="text-indent:1em" | 181m1Hf
 * colspan="3" style="text-indent:2em" | 595(3) keV
 * 80(5) μs
 * (9/2+)
 * style="text-indent:1em" | 181m2Hf
 * colspan="3" style="text-indent:2em" | 1040(10) keV
 * ~100 μs
 * (17/2+)
 * style="text-indent:1em" | 181m3Hf
 * colspan="3" style="text-indent:2em" | 1738(10) keV
 * 1.5(5) ms
 * (27/2−)
 * 182Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 110
 * 181.950554(7)
 * 8.90(9)×106 y
 * β−
 * 182Ta
 * 0+
 * rowspan=2 style="text-indent:1em" | 182mHf
 * rowspan=2 colspan="3" style="text-indent:2em" | 1172.88(18) keV
 * rowspan=2|61.5(15) min
 * β− (58%)
 * 182Ta
 * rowspan=2|8−
 * rowspan=2|
 * rowspan=2|
 * IT (42%)
 * 182Hf
 * 183Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 111
 * 182.95353(3)
 * 1.067(17) h
 * β−
 * 183Ta
 * (3/2−)
 * 184Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 112
 * 183.95545(4)
 * 4.12(5) h
 * β−
 * 184Ta
 * 0+
 * style="text-indent:1em" | 184mHf
 * colspan="3" style="text-indent:2em" | 1272.4(4) keV
 * 48(10) s
 * β−
 * 184Ta
 * 8−
 * 185Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 113
 * 184.95882(21)#
 * 3.5(6) min
 * β−
 * 185Ta
 * 3/2−#
 * 186Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 114
 * 185.96089(32)#
 * 2.6(12) min
 * β−
 * 186Ta
 * 0+
 * 187Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 115
 * 186.96457(22)#
 * 14# s [>300 ns]
 * 9/2−#
 * style="text-indent:1em" | 187mHf
 * colspan="3" style="text-indent:2em" |500(300)# keV
 * 270(80) ns
 * IT
 * 187Hf
 * 3/2−#
 * 188Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 116
 * 187.96690(32)#
 * 20# s [>300 ns]
 * 0+
 * 189Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 117
 * 188.97085(32)#
 * 400# ms [>300 ns]
 * 3/2−#
 * 190Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 118
 * 189.97338(43)#
 * 600# ms [>300 ns]
 * 0+
 * 191Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 119
 * 192Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 120
 * 0+
 * 0+
 * style="text-indent:1em" | 184mHf
 * colspan="3" style="text-indent:2em" | 1272.4(4) keV
 * 48(10) s
 * β−
 * 184Ta
 * 8−
 * 185Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 113
 * 184.95882(21)#
 * 3.5(6) min
 * β−
 * 185Ta
 * 3/2−#
 * 186Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 114
 * 185.96089(32)#
 * 2.6(12) min
 * β−
 * 186Ta
 * 0+
 * 187Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 115
 * 186.96457(22)#
 * 14# s [>300 ns]
 * 9/2−#
 * style="text-indent:1em" | 187mHf
 * colspan="3" style="text-indent:2em" |500(300)# keV
 * 270(80) ns
 * IT
 * 187Hf
 * 3/2−#
 * 188Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 116
 * 187.96690(32)#
 * 20# s [>300 ns]
 * 0+
 * 189Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 117
 * 188.97085(32)#
 * 400# ms [>300 ns]
 * 3/2−#
 * 190Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 118
 * 189.97338(43)#
 * 600# ms [>300 ns]
 * 0+
 * 191Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 119
 * 192Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 120
 * 0+
 * 0+
 * 189Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 117
 * 188.97085(32)#
 * 400# ms [>300 ns]
 * 3/2−#
 * 190Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 118
 * 189.97338(43)#
 * 600# ms [>300 ns]
 * 0+
 * 191Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 119
 * 192Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 120
 * 0+
 * 189.97338(43)#
 * 600# ms [>300 ns]
 * 0+
 * 191Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 119
 * 192Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 120
 * 0+
 * style="text-align:right" | 119
 * 192Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 120
 * 0+
 * 192Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 120
 * 0+
 * 192Hf
 * style="text-align:right" | 72
 * style="text-align:right" | 120
 * 0+
 * 0+
 * 0+
 * 0+
 * 0+