⁸⁷Ru — Unstable · t½ ≈ 4.75 min · Decay: β⁺ → ⁸⁷Tc · Type: synthetic · Uses: research.
⁸⁸Ru — Unstable · t½ ≈ 18.5 min · Decay: β⁺ → ⁸⁸Tc · Type: synthetic · Uses: research.
⁸⁹Ru — Unstable · t½ ≈ 1.3 min · Decay: β⁺ → ⁸⁹Tc · Type: synthetic · Uses: research.
⁹⁰Ru — Unstable · t½ ≈ 7.6 min · Decay: β⁺ → ⁹⁰Tc · Type: synthetic · Uses: research.
⁹¹Ru — Unstable · t½ ≈ 7.9 min · Decay: β⁺ → ⁹¹Tc · Type: synthetic · Uses: research.
⁹²Ru — Unstable · t½ ≈ 3.6 min · Decay: β⁺ → ⁹²Tc · Type: synthetic · Uses: research.
⁹³Ru — Unstable · t½ ≈ 59 s · Decay: β⁺ → ⁹³Tc · Type: synthetic · Uses: research.
⁹⁴Ru — Unstable · t½ ≈ 51.8 min · Decay: β⁺ → ⁹⁴Tc · Type: synthetic · Uses: research.
⁹⁵Ru — Unstable · t½ ≈ 1.64 h · Decay: β⁺ → ⁹⁵Tc · Type: synthetic · Uses: research.
⁹⁶Ru — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
⁹⁷Ru — Stable · — · Type: stable (primordial) · Uses: isotopic tracer, catalysts.
⁹⁸Ru — Stable · — · Type: stable (primordial) · Uses: alloys, catalysts, isotope tracer.
⁹⁹Ru — Stable · — · Type: stable (primordial) · Uses: isotopic tracer.
¹⁰⁰Ru — Stable · — · Type: stable (primordial) · Uses: isotope tracer, nuclear physics.
¹⁰¹Ru — Stable · — · Type: stable (primordial) · Uses: isotope tracer, catalysis.
¹⁰²Ru — Stable · — · Type: stable (primordial, most abundant) · Uses: alloys, catalysts, nuclear studies.
¹⁰³Ru — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁰⁴Ru — Stable · — · Type: stable (primordial) · Uses: isotope tracer, nuclear structure.
¹⁰⁵Ru — Unstable · t½ ≈ 4.4 h · Decay: β⁻ → ¹⁰⁵Rh · Type: activation · Uses: tracer.
¹⁰⁶Ru — Unstable · t½ ≈ 373.6 d · Decay: β⁻ → ¹⁰⁶Rh · Type: fission product · Uses: environmental tracer, nuclear monitoring.
¹⁰⁷Ru — Unstable · t½ ≈ 3.75 min · Decay: β⁻ → ¹⁰⁷Rh · Type: synthetic · Uses: research.
¹⁰⁸Ru — Unstable · t½ ≈ 4.55 min · Decay: β⁻ → ¹⁰⁸Rh · Type: synthetic · Uses: research.
¹⁰⁹Ru — Unstable · t½ ≈ 34 s · Decay: β⁻ → ¹⁰⁹Rh · Type: synthetic · Uses: research.
¹¹⁰Ru — Unstable · t½ ≈ 22.6 s · Decay: β⁻ → ¹¹⁰Rh · Type: synthetic · Uses: research.
¹¹¹Ru — Unstable · t½ ≈ 7.0 s · Decay: β⁻ → ¹¹¹Rh · Type: synthetic · Uses: research.
¹¹²Ru — Unstable · t½ ≈ 2.9 s · Decay: β⁻ → ¹¹²Rh · Type: synthetic · Uses: research.
¹¹³Ru — Unstable · t½ ≈ 1.8 s · Decay: β⁻ → ¹¹³Rh · Type: synthetic · Uses: research.
¹¹⁴Ru — Unstable · t½ ≈ 0.54 s · Decay: β⁻ → ¹¹⁴Rh · Type: synthetic · Uses: research.
¹¹⁵Ru — Unstable · t½ ≈ 0.36 s · Decay: β⁻ → ¹¹⁵Rh · Type: synthetic · Uses: research.
¹¹⁶Ru — Unstable · t½ ≈ 0.25 s · Decay: β⁻ → ¹¹⁶Rh · Type: synthetic · Uses: research.
¹¹⁷Ru — Unstable · t½ ≈ 0.18 s · Decay: β⁻ → ¹¹⁷Rh · Type: synthetic · Uses: research.
¹¹⁸Ru — Unstable · t½ ≈ 0.13 s · Decay: β⁻ → ¹¹⁸Rh · Type: synthetic · Uses: research.
¹¹⁹Ru — Unstable · t½ ≈ 0.09 s · Decay: β⁻ → ¹¹⁹Rh · Type: synthetic · Uses: research.
¹²⁰Ru — Unstable · t½ ≈ 0.07 s · Decay: β⁻ → ¹²⁰Rh · Type: synthetic · Uses: research.
¹²¹Ru — Unstable · t½ ≈ 0.06 s · Decay: β⁻ → ¹²¹Rh · Type: synthetic · Uses: research.
¹²²Ru — Unstable · t½ ≈ 0.05 s · Decay: β⁻ → ¹²²Rh · Type: synthetic · Uses: research.
¹²³Ru — Unstable · t½ ≈ 0.04 s · Decay: β⁻ → ¹²³Rh · Type: synthetic · Uses: research.
¹²⁴Ru — Unstable · t½ ≈ 0.03 s · Decay: β⁻ → ¹²⁴Rh · Type: synthetic · Uses: research.
Ruthenium — isotope count: 38 total · Stable: 7 (⁹⁶Ru, ⁹⁸Ru, ⁹⁹Ru, ¹⁰⁰Ru, ¹⁰¹Ru, ¹⁰²Ru, ¹⁰⁴Ru) · Unstable: 31.
(Data: IAEA LiveChart, NUBASE2020, ENSDF; notable applications include ¹⁰⁶Ru as a fission product tracer, Ru catalysts, and stable Ru isotopes in materials science.)