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Hafnium-177

Main isotopes of hafnium
Iso­tope Decay
abun­dance half-life mode energy (MeV) pro­duct
172Hf syn 1.87 y ε 0.350 172Lu
174Hf 0.16% 2×1015 y α 2.495 170Yb
176Hf 5.26% is stable with 104 neutrons
177Hf 18.60% is stable with 105 neutrons
178Hf 27.28% is stable with 106 neutrons
178m2Hf syn 31 y IT 2.446 178Hf
179Hf 13.62% is stable with 107 neutrons
180Hf 35.08% is stable with 108 neutrons
182Hf syn 8.9×106 y β 0.373 182Ta
Standard atomic weight (Ar)
  • 178.49(2)

Natural hafnium (72Hf) consists of five stable isotopes (176Hf, 177Hf, 178Hf, 179Hf, and 180Hf) and one very long-lived radioisotope, 174Hf, with a half-life of 2×1015 years. In addition, there are 30 other known radionuclides, the most stable of which is 182Hf with a half-life of 8.9×106 years. No other radioisotope has a half-life over 1.87 days. Most isotopes have half-lives under 1 minute. There are also 26 known nuclear isomers, the most stable of which is 178m2Hf with a half-life of 31 years.



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