²³⁷Cf — Unstable · t½ ≈ 2.5 min · Decay: β⁺ → ²³⁷Bk · Type: synthetic · Uses: research.
²³⁸Cf — Unstable · t½ ≈ 21.0 min · Decay: β⁺ → ²³⁸Bk · Type: synthetic · Uses: research.
²³⁹Cf — Unstable · t½ ≈ 2.7 min · Decay: β⁺ → ²³⁹Bk · Type: synthetic · Uses: research.
²⁴⁰Cf — Unstable · t½ ≈ 3.8 min · Decay: β⁺ → ²⁴⁰Bk · Type: synthetic · Uses: research.
²⁴¹Cf — Unstable · t½ ≈ 12.0 min · Decay: β⁺ → ²⁴¹Bk · Type: synthetic · Uses: research.
²⁴²Cf — Unstable · t½ ≈ 3.5 min · Decay: β⁺ → ²⁴²Bk · Type: synthetic · Uses: research.
²⁴³Cf — Unstable · t½ ≈ 10.6 min · Decay: β⁺ → ²⁴³Bk · Type: synthetic · Uses: research.
²⁴⁴Cf — Unstable · t½ ≈ 19.0 min · Decay: β⁺ → ²⁴⁴Bk · Type: synthetic · Uses: research.
²⁴⁵Cf — Unstable · t½ ≈ 45.0 min · Decay: β⁺ → ²⁴⁵Bk · Type: synthetic · Uses: research.
²⁴⁶Cf — Unstable · t½ ≈ 35.7 h · Decay: β⁻ → ²⁴⁶Es · Type: synthetic · Uses: research.
²⁴⁷Cf — Unstable · t½ ≈ 3.11 h · Decay: β⁻ → ²⁴⁷Es · Type: synthetic · Uses: research.
²⁴⁸Cf — Unstable · t½ ≈ 333.5 d · Decay: α → ²⁴⁴Cm · Type: synthetic · Uses: research.
²⁴⁹Cf — Unstable · t½ ≈ 351 y · Decay: α → ²⁴⁵Cm · Type: long-lived radionuclide · Uses: tracer, heavy-element studies.
²⁵⁰Cf — Unstable · t½ ≈ 13.1 y · Decay: α → ²⁴⁶Cm · Type: synthetic · Uses: research.
²⁵¹Cf — Unstable · t½ ≈ 898 y · Decay: α → ²⁴⁷Cm · Type: long-lived radionuclide · Uses: research.
²⁵²Cf — Unstable · t½ ≈ 2.645 y · Decay: α → ²⁴⁸Cm (spontaneous fission ≈ 3%) · Type: synthetic · Uses: neutron source (industrial, radiography, reactor startup).
²⁵³Cf — Unstable · t½ ≈ 17.8 d · Decay: β⁻ → ²⁵³Es · Type: synthetic · Uses: research.
²⁵⁴Cf — Unstable · t½ ≈ 60.5 d · Decay: α → ²⁵⁰Cm · Type: synthetic · Uses: research.
²⁵⁵Cf — Unstable · t½ ≈ 85.0 min · Decay: β⁻ → ²⁵⁵Es · Type: synthetic · Uses: research.
²⁵⁶Cf — Unstable · t½ ≈ 12.3 min · Decay: β⁻ → ²⁵⁶Es · Type: synthetic · Uses: research.
Californium — isotope count: 20 total · Stable: none · Unstable: 20.
(Data: IAEA LiveChart, NUBASE2020, ENSDF, Wikipedia “Isotopes of californium.” Notable applications: ²⁵²Cf as a strong neutron source in reactor startup, industrial radiography, oil exploration.)
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