¹⁵³Hf — Unstable · t½ ≈ 0.3 s · Decay: β⁺ → ¹⁵³Lu · Type: synthetic · Uses: research.
¹⁵⁴Hf — Unstable · t½ ≈ 2.0 s · Decay: β⁺ → ¹⁵⁴Lu · Type: synthetic · Uses: research.
¹⁵⁵Hf — Unstable · t½ ≈ 2.0 s · Decay: β⁺ → ¹⁵⁵Lu · Type: synthetic · Uses: research.
¹⁵⁶Hf — Unstable · t½ ≈ 2.0 s · Decay: β⁺ → ¹⁵⁶Lu · Type: synthetic · Uses: research.
¹⁵⁷Hf — Unstable · t½ ≈ 1.5 s · Decay: β⁺ → ¹⁵⁷Lu · Type: synthetic · Uses: research.
¹⁵⁸Hf — Unstable · t½ ≈ 3.0 s · Decay: β⁺ → ¹⁵⁸Lu · Type: synthetic · Uses: research.
¹⁵⁹Hf — Unstable · t½ ≈ 5.0 s · Decay: β⁺ → ¹⁵⁹Lu · Type: synthetic · Uses: research.
¹⁶⁰Hf — Unstable · t½ ≈ 6.0 s · Decay: β⁺ → ¹⁶⁰Lu · Type: synthetic · Uses: research.
¹⁶¹Hf — Unstable · t½ ≈ 9.0 s · Decay: β⁺ → ¹⁶¹Lu · Type: synthetic · Uses: research.
¹⁶²Hf — Unstable · t½ ≈ 18.0 s · Decay: β⁺ → ¹⁶²Lu · Type: synthetic · Uses: research.
¹⁶³Hf — Unstable · t½ ≈ 40.0 s · Decay: β⁺ → ¹⁶³Lu · Type: synthetic · Uses: research.
¹⁶⁴Hf — Unstable · t½ ≈ 1.0 min · Decay: β⁺ → ¹⁶⁴Lu · Type: synthetic · Uses: research.
¹⁶⁵Hf — Unstable · t½ ≈ 1.9 min · Decay: β⁺ → ¹⁶⁵Lu · Type: synthetic · Uses: research.
¹⁶⁶Hf — Unstable · t½ ≈ 6.8 min · Decay: β⁺ → ¹⁶⁶Lu · Type: synthetic · Uses: research.
¹⁶⁷Hf — Unstable · t½ ≈ 2.1 min · Decay: β⁺ → ¹⁶⁷Lu · Type: synthetic · Uses: research.
¹⁶⁸Hf — Unstable · t½ ≈ 25.9 min · Decay: β⁺ → ¹⁶⁸Lu · Type: synthetic · Uses: research.
¹⁶⁹Hf — Unstable · t½ ≈ 3.2 min · Decay: β⁺ → ¹⁶⁹Lu · Type: synthetic · Uses: research.
¹⁷⁰Hf — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁷¹Hf — Unstable · t½ ≈ 12.1 h · Decay: β⁻ → ¹⁷¹Ta · Type: tracer · Uses: nuclear research.
¹⁷²Hf — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁷³Hf — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁷⁴Hf — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁷⁵Hf — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁷⁶Hf — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁷⁷Hf — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁷⁸Hf — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁷⁹Hf — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁸⁰Hf — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁸¹Hf — Unstable · t½ ≈ 42.4 d · Decay: β⁻ → ¹⁸¹Ta · Type: activation product · Uses: tracer.
¹⁸²Hf — Unstable · t½ ≈ 8.9×10⁶ y · Decay: β⁻ → ¹⁸²W · Type: primordial radionuclide · Uses: geochronology, cosmochronology.
¹⁸³Hf — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁸⁴Hf — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁸⁵Hf — Unstable · t½ ≈ 1.2 min · Decay: β⁻ → ¹⁸⁵Ta · Type: synthetic · Uses: research.
Hafnium — isotope count: 33 total · Stable: 6 (¹⁷⁰Hf, ¹⁷²Hf, ¹⁷⁴Hf, ¹⁷⁶Hf, ¹⁷⁷Hf, ¹⁷⁸Hf, ¹⁷⁹Hf, ¹⁸⁰Hf, ¹⁸³Hf, ¹⁸⁴Hf) · Unstable: 23.
(Data: IAEA LiveChart, NUBASE2020, ENSDF; notable applications: ¹⁷⁶Hf/¹⁷⁷Hf in geochemistry and Lu–Hf dating, ¹⁸²Hf in early solar system chronometry, Hf isotopes in nuclear control rods and alloys.)
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