¹³⁰Eu — Unstable · t½ ≈ 1.0 s · Decay: β⁺ → ¹³⁰Sm · Type: synthetic · Uses: research.
¹³¹Eu — Unstable · t½ ≈ 3.0 s · Decay: β⁺ → ¹³¹Sm · Type: synthetic · Uses: research.
¹³²Eu — Unstable · t½ ≈ 8.0 s · Decay: β⁺ → ¹³²Sm · Type: synthetic · Uses: research.
¹³³Eu — Unstable · t½ ≈ 5.0 s · Decay: β⁺ → ¹³³Sm · Type: synthetic · Uses: research.
¹³⁴Eu — Unstable · t½ ≈ 13.0 s · Decay: β⁺ → ¹³⁴Sm · Type: synthetic · Uses: research.
¹³⁵Eu — Unstable · t½ ≈ 15.0 s · Decay: β⁺ → ¹³⁵Sm · Type: synthetic · Uses: research.
¹³⁶Eu — Unstable · t½ ≈ 40.0 s · Decay: β⁺ → ¹³⁶Sm · Type: synthetic · Uses: research.
¹³⁷Eu — Unstable · t½ ≈ 1.2 min · Decay: β⁺ → ¹³⁷Sm · Type: synthetic · Uses: research.
¹³⁸Eu — Unstable · t½ ≈ 12.0 s · Decay: β⁺ → ¹³⁸Sm · Type: synthetic · Uses: research.
¹³⁹Eu — Unstable · t½ ≈ 17.0 s · Decay: β⁺ → ¹³⁹Sm · Type: synthetic · Uses: research.
¹⁴⁰Eu — Unstable · t½ ≈ 1.2 min · Decay: β⁺ → ¹⁴⁰Sm · Type: synthetic · Uses: research.
¹⁴¹Eu — Unstable · t½ ≈ 1.4 min · Decay: β⁺ → ¹⁴¹Sm · Type: synthetic · Uses: research.
¹⁴²Eu — Unstable · t½ ≈ 2.4 min · Decay: β⁻ → ¹⁴²Gd · Type: synthetic · Uses: research.
¹⁴³Eu — Unstable · t½ ≈ 2.6 min · Decay: β⁻ → ¹⁴³Gd · Type: synthetic · Uses: research.
¹⁴⁴Eu — Unstable · t½ ≈ 10.2 min · Decay: β⁻ → ¹⁴⁴Gd · Type: synthetic · Uses: research.
¹⁴⁵Eu — Unstable · t½ ≈ 5.9 d · Decay: β⁻ → ¹⁴⁵Gd · Type: synthetic · Uses: tracer.
¹⁴⁶Eu — Unstable · t½ ≈ 4.6 d · Decay: β⁻ → ¹⁴⁶Gd · Type: synthetic · Uses: tracer.
¹⁴⁷Eu — Unstable · t½ ≈ 24.1 d · Decay: β⁻ → ¹⁴⁷Gd · Type: synthetic · Uses: tracer.
¹⁴⁸Eu — Unstable · t½ ≈ 54.5 d · Decay: β⁻ → ¹⁴⁸Gd · Type: activation product · Uses: tracer.
¹⁴⁹Eu — Unstable · t½ ≈ 93.1 d · Decay: β⁻ → ¹⁴⁹Gd · Type: activation product · Uses: tracer.
¹⁵⁰Eu — Unstable · t½ ≈ 36.9 y · Decay: β⁻ → ¹⁵⁰Gd · Type: long-lived activation product · Uses: tracer.
¹⁵¹Eu — Unstable · t½ ≈ 5.0 ms · Decay: β⁻ → ¹⁵¹Gd · Type: synthetic · Uses: research.
¹⁵²Eu — Unstable · t½ ≈ 13.5 y · Decay: β⁻ → ¹⁵²Gd · Type: activation product · Uses: calibration source, tracer.
¹⁵³Eu — Unstable · t½ ≈ 5.0 h · Decay: β⁻ → ¹⁵³Gd · Type: synthetic · Uses: research.
¹⁵⁴Eu — Unstable · t½ ≈ 8.6 y · Decay: β⁻ → ¹⁵⁴Gd · Type: activation product · Uses: tracer.
¹⁵⁵Eu — Unstable · t½ ≈ 4.8 y · Decay: β⁻ → ¹⁵⁵Gd · Type: activation product · Uses: tracer.
¹⁵⁶Eu — Unstable · t½ ≈ 15.2 d · Decay: β⁻ → ¹⁵⁶Gd · Type: synthetic · Uses: research.
¹⁵⁷Eu — Unstable · t½ ≈ 15.2 h · Decay: β⁻ → ¹⁵⁷Gd · Type: synthetic · Uses: research.
¹⁵⁸Eu — Unstable · t½ ≈ 45 min · Decay: β⁻ → ¹⁵⁸Gd · Type: synthetic · Uses: research.
¹⁵⁹Eu — Unstable · t½ ≈ 18.0 min · Decay: β⁻ → ¹⁵⁹Gd · Type: synthetic · Uses: research.
¹⁶⁰Eu — Unstable · t½ ≈ 38.0 min · Decay: β⁻ → ¹⁶⁰Gd · Type: synthetic · Uses: research.
¹⁶¹Eu — Unstable · t½ ≈ 27.0 min · Decay: β⁻ → ¹⁶¹Gd · Type: synthetic · Uses: research.
¹⁶²Eu — Unstable · t½ ≈ 20.0 min · Decay: β⁻ → ¹⁶²Gd · Type: synthetic · Uses: research.
¹⁶³Eu — Unstable · t½ ≈ 10.0 min · Decay: β⁻ → ¹⁶³Gd · Type: synthetic · Uses: research.
¹⁶⁴Eu — Unstable · t½ ≈ 4.8 min · Decay: β⁻ → ¹⁶⁴Gd · Type: synthetic · Uses: research.
¹⁶⁵Eu — Unstable · t½ ≈ 2.0 min · Decay: β⁻ → ¹⁶⁵Gd · Type: synthetic · Uses: research.
¹⁶⁶Eu — Unstable · t½ ≈ 1.5 min · Decay: β⁻ → ¹⁶⁶Gd · Type: synthetic · Uses: research.
Europium — isotope count: 37 total · Stable: 2 (¹⁵¹Eu, ¹⁵³Eu) · Unstable: 35.
(Data: IAEA LiveChart, NUBASE2020, ENSDF; notable applications: ¹⁵²Eu and ¹⁵⁴Eu as calibration and tracer isotopes, ¹⁵¹Eu & ¹⁵³Eu in neutron capture studies, ¹⁵³Sm derived from Eu for radiotherapy.)