¹⁴⁴Er — Unstable · t½ ≈ 11 ms · Decay: β⁺ → ¹⁴⁴Ho · Type: synthetic · Uses: research.
¹⁴⁵Er — Unstable · t½ ≈ 70 ms · Decay: β⁺ → ¹⁴⁵Ho · Type: synthetic · Uses: research.
¹⁴⁶Er — Unstable · t½ ≈ 220 ms · Decay: β⁺ → ¹⁴⁶Ho · Type: synthetic · Uses: research.
¹⁴⁷Er — Unstable · t½ ≈ 2.4 s · Decay: β⁺ → ¹⁴⁷Ho · Type: synthetic · Uses: research.
¹⁴⁸Er — Unstable · t½ ≈ 4.6 s · Decay: β⁺ → ¹⁴⁸Ho · Type: synthetic · Uses: research.
¹⁴⁹Er — Unstable · t½ ≈ 4.1 s · Decay: β⁺ → ¹⁴⁹Ho · Type: synthetic · Uses: research.
¹⁵⁰Er — Unstable · t½ ≈ 10.6 s · Decay: β⁺ → ¹⁵⁰Ho · Type: synthetic · Uses: research.
¹⁵¹Er — Unstable · t½ ≈ 23.0 s · Decay: β⁺ → ¹⁵¹Ho · Type: synthetic · Uses: research.
¹⁵²Er — Unstable · t½ ≈ 10.3 min · Decay: β⁺ → ¹⁵²Ho · Type: synthetic · Uses: research.
¹⁵³Er — Unstable · t½ ≈ 8.8 min · Decay: β⁺ → ¹⁵³Ho · Type: synthetic · Uses: research.
¹⁵⁴Er — Unstable · t½ ≈ 3.7 h · Decay: β⁺ → ¹⁵⁴Ho · Type: synthetic · Uses: research.
¹⁵⁵Er — Unstable · t½ ≈ 9.4 h · Decay: β⁺ → ¹⁵⁵Ho · Type: synthetic · Uses: research.
¹⁵⁶Er — Unstable · t½ ≈ 19.5 h · Decay: β⁺ → ¹⁵⁶Ho · Type: synthetic · Uses: research.
¹⁵⁷Er — Unstable · t½ ≈ 36.0 h · Decay: β⁻ → ¹⁵⁷Tm · Type: synthetic · Uses: research.
¹⁵⁸Er — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁵⁹Er — Unstable · t½ ≈ 36.0 h · Decay: β⁻ → ¹⁵⁹Tm · Type: synthetic · Uses: research.
¹⁶⁰Er — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁶¹Er — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁶²Er — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁶³Er — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁶⁴Er — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁶⁵Er — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁶⁶Er — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁶⁷Er — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁶⁸Er — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁶⁹Er — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁷⁰Er — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁷¹Er — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁷²Er — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁷³Er — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁷⁴Er — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁷⁵Er — Unstable · t½ ≈ 4.0 h · Decay: β⁻ → ¹⁷⁵Tm · Type: synthetic · Uses: research.
¹⁷⁶Er — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹⁷⁷Er — Unstable · t½ ≈ 2.6 h · Decay: β⁻ → ¹⁷⁷Tm · Type: synthetic · Uses: research.
Erbium — isotope count: 34 total · Stable: 8 (¹⁵⁸Er, ¹⁶⁰Er, ¹⁶²Er, ¹⁶⁴Er, ¹⁶⁶Er, ¹⁶⁸Er, ¹⁷⁰Er, ¹⁷²Er, ¹⁷³Er, ¹⁷⁴Er, ¹⁷⁶Er) · Unstable: 23.
(Data: IAEA LiveChart, NUBASE2020, ENSDF; notable applications: Er isotopes in lasers (¹⁶⁷Er), nuclear research, and tracers in materials science.)