²⁵³Rf — Unstable · t½ ≈ 50 μs · Decay: α → ²⁴⁹No · Type: synthetic · Uses: research.
²⁵⁴Rf — Unstable · t½ ≈ 23 μs · Decay: α → ²⁵⁰No · Type: synthetic · Uses: research.
²⁵⁵Rf — Unstable · t½ ≈ 1.5 ms · Decay: α → ²⁵¹No · Type: synthetic · Uses: research.
²⁵⁶Rf — Unstable · t½ ≈ 6.7 ms · Decay: α → ²⁵²No · Type: synthetic · Uses: research.
²⁵⁷Rf — Unstable · t½ ≈ 4.0 ms · Decay: α → ²⁵³No · Type: synthetic · Uses: research.
²⁵⁸Rf — Unstable · t½ ≈ 14.0 ms · Decay: α → ²⁵⁴No · Type: synthetic · Uses: research.
²⁵⁹Rf — Unstable · t½ ≈ 2.5 s · Decay: α → ²⁵⁵No · Type: synthetic · Uses: research.
²⁶⁰Rf — Unstable · t½ ≈ 2.7 s · Decay: α → ²⁵⁶No · Type: synthetic · Uses: research.
²⁶¹Rf — Unstable · t½ ≈ 1.0 min · Decay: α → ²⁵⁷No · Type: synthetic · Uses: research.
²⁶²Rf — Unstable · t½ ≈ 2.1 s · Decay: α → ²⁵⁸No · Type: synthetic · Uses: research.
²⁶³Rf — Unstable · t½ ≈ 10.0 min · Decay: α → ²⁵⁹No · Type: synthetic · Uses: research.
²⁶⁴Rf — Unstable · t½ ≈ 1.0 min · Decay: α → ²⁶⁰No · Type: synthetic · Uses: research.
²⁶⁵Rf — Unstable · t½ ≈ 1.6 min · Decay: α → ²⁶¹No · Type: synthetic · Uses: research.
²⁶⁶Rf — Unstable · t½ ≈ 2.0 min · Decay: α → ²⁶²No · Type: synthetic · Uses: research.
²⁶⁷Rf — Unstable · t½ ≈ 1.3 h · Decay: α → ²⁶³No · Type: synthetic · Uses: research.
²⁶⁸Rf — Unstable · t½ ≈ 1.0 h · Decay: α → ²⁶⁴No · Type: synthetic · Uses: research.
²⁶⁹Rf — Unstable · t½ ≈ 5.0 s · Decay: α → ²⁶⁵No · Type: synthetic · Uses: research.
²⁷⁰Rf — Unstable · t½ ≈ 22.0 s · Decay: α → ²⁶⁶No · Type: synthetic · Uses: research.
Rutherfordium — isotope count: 18 total · Stable: none · Unstable: 18.
(Data: IAEA LiveChart, NUBASE2020, ENSDF, Wikipedia “Isotopes of rutherfordium.” Notable applications: all isotopes used exclusively for superheavy element research; ²⁶³Rf and ²⁶⁸Rf are relatively longer-lived, allowing chemical investigations.)