¹³⁴Gd — Unstable · t½ ≈ 1.1 min · Decay: β⁺ → ¹³⁴Eu · Type: synthetic · Uses: research.
¹³⁵Gd — Unstable · t½ ≈ 1.2 min · Decay: β⁺ → ¹³⁵Eu · Type: synthetic · Uses: research.
¹³⁶Gd — Unstable · t½ ≈ 10.0 s · Decay: β⁺ → ¹³⁶Eu · Type: synthetic · Uses: research.
¹³⁷Gd — Unstable · t½ ≈ 2.2 s · Decay: β⁺ → ¹³⁷Eu · Type: synthetic · Uses: research.
¹³⁸Gd — Unstable · t½ ≈ 4.9 s · Decay: β⁺ → ¹³⁸Eu · Type: synthetic · Uses: research.
¹³⁹Gd — Unstable · t½ ≈ 5.7 s · Decay: β⁺ → ¹³⁹Eu · Type: synthetic · Uses: research.
¹⁴⁰Gd — Unstable · t½ ≈ 13.0 s · Decay: β⁺ → ¹⁴⁰Eu · Type: synthetic · Uses: research.
¹⁴¹Gd — Unstable · t½ ≈ 4.2 min · Decay: β⁺ → ¹⁴¹Eu · Type: synthetic · Uses: research.
¹⁴²Gd — Unstable · t½ ≈ 70.0 s · Decay: β⁺ → ¹⁴²Eu · Type: synthetic · Uses: research.
¹⁴³Gd — Unstable · t½ ≈ 39.0 s · Decay: β⁺ → ¹⁴³Eu · Type: synthetic · Uses: research.
¹⁴⁴Gd — Unstable · t½ ≈ 4.2 min · Decay: β⁺ → ¹⁴⁴Eu · Type: synthetic · Uses: research.
¹⁴⁵Gd — Unstable · t½ ≈ 21.0 min · Decay: β⁺ → ¹⁴⁵Eu · Type: synthetic · Uses: research.
¹⁴⁶Gd — Unstable · t½ ≈ 48.0 d · Decay: β⁻ → ¹⁴⁶Tb · Type: activation product · Uses: tracer.
¹⁴⁷Gd — Unstable · t½ ≈ 38.0 h · Decay: β⁻ → ¹⁴⁷Tb · Type: activation product · Uses: tracer.
¹⁴⁸Gd — Unstable · t½ ≈ 74.0 y · Decay: α → ¹⁴⁴Sm · Type: primordial radionuclide · Uses: geochronology.
¹⁴⁹Gd — Unstable · t½ ≈ 9.4 d · Decay: β⁻ → ¹⁴⁹Tb · Type: activation product · Uses: tracer.
¹⁵⁰Gd — Stable · — · Type: stable (primordial) · Uses: isotopic tracer.
¹⁵¹Gd — Unstable · t½ ≈ 120 d · Decay: β⁻ → ¹⁵¹Tb · Type: activation product · Uses: tracer.
¹⁵²Gd — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁵³Gd — Unstable · t½ ≈ 240 d · Decay: β⁻ → ¹⁵³Tb · Type: activation product · Uses: tracer.
¹⁵⁴Gd — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁵⁵Gd — Unstable · t½ ≈ 1.8 h · Decay: β⁻ → ¹⁵⁵Tb · Type: synthetic · Uses: research.
¹⁵⁶Gd — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁵⁷Gd — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁵⁸Gd — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁵⁹Gd — Unstable · t½ ≈ 18.6 h · Decay: β⁻ → ¹⁵⁹Tb · Type: synthetic · Uses: research.
¹⁶⁰Gd — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁶¹Gd — Unstable · t½ ≈ 3.7 min · Decay: β⁻ → ¹⁶¹Tb · Type: synthetic · Uses: research.
¹⁶²Gd — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁶³Gd — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁶⁴Gd — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁶⁵Gd — Unstable · t½ ≈ 20.0 min · Decay: β⁻ → ¹⁶⁵Tb · Type: synthetic · Uses: research.
¹⁶⁶Gd — Unstable · t½ ≈ 2.7 d · Decay: β⁻ → ¹⁶⁶Tb · Type: activation product · Uses: tracer.
¹⁶⁷Gd — Unstable · t½ ≈ 18.0 h · Decay: β⁻ → ¹⁶⁷Tb · Type: synthetic · Uses: research.
¹⁶⁸Gd — Unstable · t½ ≈ 3.0 min · Decay: β⁻ → ¹⁶⁸Tb · Type: synthetic · Uses: research.
Gadolinium — isotope count: 35 total · Stable: 7 (¹⁵²Gd, ¹⁵⁴Gd, ¹⁵⁵Gd, ¹⁵⁶Gd, ¹⁵⁷Gd, ¹⁵⁸Gd, ¹⁶⁰Gd, ¹⁶²Gd, ¹⁶³Gd, ¹⁶⁴Gd) · Unstable: 25.
(Data: IAEA LiveChart, NUBASE2020, ENSDF; notable applications: Gd isotopes in neutron capture therapy, MRI contrast agents, reactor shielding, and tracers in geochemistry.)
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