¹¹⁷La — Unstable · t½ ≈ 11 ms · Decay: β⁺ → ¹¹⁷Ba · Type: synthetic · Uses: research.
¹¹⁸La — Unstable · t½ ≈ 60 ms · Decay: β⁺ → ¹¹⁸Ba · Type: synthetic · Uses: research.
¹¹⁹La — Unstable · t½ ≈ 90 ms · Decay: β⁺ → ¹¹⁹Ba · Type: synthetic · Uses: research.
¹²⁰La — Unstable · t½ ≈ 1.5 s · Decay: β⁺ → ¹²⁰Ba · Type: synthetic · Uses: research.
¹²¹La — Unstable · t½ ≈ 1.7 s · Decay: β⁺ → ¹²¹Ba · Type: synthetic · Uses: research.
¹²²La — Unstable · t½ ≈ 3.6 s · Decay: β⁺ → ¹²²Ba · Type: synthetic · Uses: research.
¹²³La — Unstable · t½ ≈ 5.2 s · Decay: β⁺ → ¹²³Ba · Type: synthetic · Uses: research.
¹²⁴La — Unstable · t½ ≈ 6.3 s · Decay: β⁺ → ¹²⁴Ba · Type: synthetic · Uses: research.
¹²⁵La — Unstable · t½ ≈ 10.0 s · Decay: β⁺ → ¹²⁵Ba · Type: synthetic · Uses: research.
¹²⁶La — Unstable · t½ ≈ 24.4 s · Decay: β⁺ → ¹²⁶Ba · Type: synthetic · Uses: research.
¹²⁷La — Unstable · t½ ≈ 45.0 s · Decay: β⁺ → ¹²⁷Ba · Type: synthetic · Uses: research.
¹²⁸La — Unstable · t½ ≈ 3.9 min · Decay: β⁺ → ¹²⁸Ba · Type: synthetic · Uses: research.
¹²⁹La — Unstable · t½ ≈ 10.6 min · Decay: β⁺ → ¹²⁹Ba · Type: synthetic · Uses: research.
¹³⁰La — Unstable · t½ ≈ 10.6 min · Decay: β⁺ → ¹³⁰Ba · Type: synthetic · Uses: research.
¹³¹La — Unstable · t½ ≈ 59 min · Decay: β⁺ → ¹³¹Ba · Type: synthetic · Uses: research.
¹³²La — Unstable · t½ ≈ 4.8 h · Decay: β⁺ → ¹³²Ba · Type: synthetic · Uses: research.
¹³³La — Unstable · t½ ≈ 3.9 h · Decay: β⁺ → ¹³³Ba · Type: synthetic · Uses: research.
¹³⁴La — Unstable · t½ ≈ 6.5 min · Decay: β⁺ → ¹³⁴Ba · Type: synthetic · Uses: research.
¹³⁵La — Unstable · t½ ≈ 19.5 h · Decay: β⁻ → ¹³⁵Ce · Type: activation product · Uses: tracer.
¹³⁶La — Unstable · t½ ≈ 9.9 min · Decay: β⁻ → ¹³⁶Ce · Type: synthetic · Uses: research.
¹³⁷La — Unstable · t½ ≈ 60,000 y · Decay: β⁻ → ¹³⁷Ce · Type: primordial radionuclide · Uses: cosmochemistry, geochronology.
¹³⁸La — Unstable · t½ ≈ 1.05×10¹¹ y · Decay: EC / β⁻ → ¹³⁸Ba / ¹³⁸Ce · Type: primordial long-lived · Uses: geochemistry.
¹³⁹La — Stable · — · Type: stable (primordial, only stable isotope) · Uses: alloys, catalysts, isotope tracer.
¹⁴⁰La — Unstable · t½ ≈ 1.68 d · Decay: β⁻ → ¹⁴⁰Ce · Type: fission product · Uses: reactor monitoring.
¹⁴¹La — Unstable · t½ ≈ 3.9 h · Decay: β⁻ → ¹⁴¹Ce · Type: synthetic · Uses: research.
¹⁴²La — Unstable · t½ ≈ 91 min · Decay: β⁻ → ¹⁴²Ce · Type: synthetic · Uses: research.
¹⁴³La — Unstable · t½ ≈ 3.8 min · Decay: β⁻ → ¹⁴³Ce · Type: synthetic · Uses: research.
¹⁴⁴La — Unstable · t½ ≈ 40.8 s · Decay: β⁻ → ¹⁴⁴Ce · Type: synthetic · Uses: research.
¹⁴⁵La — Unstable · t½ ≈ 24.8 s · Decay: β⁻ → ¹⁴⁵Ce · Type: synthetic · Uses: research.
¹⁴⁶La — Unstable · t½ ≈ 9.0 s · Decay: β⁻ → ¹⁴⁶Ce · Type: synthetic · Uses: research.
¹⁴⁷La — Unstable · t½ ≈ 4.9 s · Decay: β⁻ → ¹⁴⁷Ce · Type: synthetic · Uses: research.
¹⁴⁸La — Unstable · t½ ≈ 1.6 s · Decay: β⁻ → ¹⁴⁸Ce · Type: synthetic · Uses: research.
¹⁴⁹La — Unstable · t½ ≈ 1.1 s · Decay: β⁻ → ¹⁴⁹Ce · Type: synthetic · Uses: research.
¹⁵⁰La — Unstable · t½ ≈ 0.9 s · Decay: β⁻ → ¹⁵⁰Ce · Type: synthetic · Uses: research.
¹⁵¹La — Unstable · t½ ≈ 0.8 s · Decay: β⁻ → ¹⁵¹Ce · Type: synthetic · Uses: research.
¹⁵²La — Unstable · t½ ≈ 0.6 s · Decay: β⁻ → ¹⁵²Ce · Type: synthetic · Uses: research.
¹⁵³La — Unstable · t½ ≈ 0.5 s · Decay: β⁻ → ¹⁵³Ce · Type: synthetic · Uses: research.
¹⁵⁴La — Unstable · t½ ≈ 0.35 s · Decay: β⁻ → ¹⁵⁴Ce · Type: synthetic · Uses: research.
¹⁵⁵La — Unstable · t½ ≈ 0.2 s · Decay: β⁻ → ¹⁵⁵Ce · Type: synthetic · Uses: research.
Lanthanum — isotope count: 39 total · Stable: 1 (¹³⁹La) · Primordial radionuclides: ¹³⁷La, ¹³⁸La · Unstable: 36.
(Data: IAEA LiveChart, NUBASE2020, ENSDF; notable applications: ¹³³Ba/¹³⁹La as calibration standards, ¹³⁷La & ¹³⁸La in geochemistry, lanthanum isotopes in catalysts and alloys.)