¹²¹Pr — Unstable · t½ ≈ 600 ms · Decay: β⁺ → ¹²¹Ce · Type: synthetic · Uses: research.
¹²²Pr — Unstable · t½ ≈ 2.0 s · Decay: β⁺ → ¹²²Ce · Type: synthetic · Uses: research.
¹²³Pr — Unstable · t½ ≈ 3.3 s · Decay: β⁺ → ¹²³Ce · Type: synthetic · Uses: research.
¹²⁴Pr — Unstable · t½ ≈ 4.0 s · Decay: β⁺ → ¹²⁴Ce · Type: synthetic · Uses: research.
¹²⁵Pr — Unstable · t½ ≈ 4.5 s · Decay: β⁺ → ¹²⁵Ce · Type: synthetic · Uses: research.
¹²⁶Pr — Unstable · t½ ≈ 7.9 s · Decay: β⁺ → ¹²⁶Ce · Type: synthetic · Uses: research.
¹²⁷Pr — Unstable · t½ ≈ 9.5 s · Decay: β⁺ → ¹²⁷Ce · Type: synthetic · Uses: research.
¹²⁸Pr — Unstable · t½ ≈ 33.0 s · Decay: β⁺ → ¹²⁸Ce · Type: synthetic · Uses: research.
¹²⁹Pr — Unstable · t½ ≈ 32.0 s · Decay: β⁺ → ¹²⁹Ce · Type: synthetic · Uses: research.
¹³⁰Pr — Unstable · t½ ≈ 40.0 s · Decay: β⁺ → ¹³⁰Ce · Type: synthetic · Uses: research.
¹³¹Pr — Unstable · t½ ≈ 3.3 min · Decay: β⁺ → ¹³¹Ce · Type: synthetic · Uses: research.
¹³²Pr — Unstable · t½ ≈ 4.1 min · Decay: β⁺ → ¹³²Ce · Type: synthetic · Uses: research.
¹³³Pr — Unstable · t½ ≈ 6.5 min · Decay: β⁺ → ¹³³Ce · Type: synthetic · Uses: research.
¹³⁴Pr — Unstable · t½ ≈ 17.0 min · Decay: β⁻ → ¹³⁴Nd · Type: synthetic · Uses: research.
¹³⁵Pr — Unstable · t½ ≈ 24.0 min · Decay: β⁻ → ¹³⁵Nd · Type: synthetic · Uses: research.
¹³⁶Pr — Unstable · t½ ≈ 13.1 min · Decay: β⁻ → ¹³⁶Nd · Type: synthetic · Uses: research.
¹³⁷Pr — Unstable · t½ ≈ 1.3 h · Decay: β⁻ → ¹³⁷Nd · Type: synthetic · Uses: research.
¹³⁸Pr — Unstable · t½ ≈ 2.1 h · Decay: β⁻ → ¹³⁸Nd · Type: synthetic · Uses: research.
¹³⁹Pr — Unstable · t½ ≈ 4.4 h · Decay: β⁻ → ¹³⁹Nd · Type: synthetic · Uses: research.
¹⁴⁰Pr — Unstable · t½ ≈ 3.4 min · Decay: β⁻ → ¹⁴⁰Nd · Type: synthetic · Uses: research.
¹⁴¹Pr — Stable · — · Type: stable (primordial, only stable isotope) · Uses: alloys, magnets, nuclear studies.
¹⁴²Pr — Unstable · t½ ≈ 19.1 h · Decay: β⁻ → ¹⁴²Nd · Type: fission product · Uses: reactor monitoring.
¹⁴³Pr — Unstable · t½ ≈ 13.6 d · Decay: β⁻ → ¹⁴³Nd · Type: synthetic · Uses: research.
¹⁴⁴Pr — Unstable · t½ ≈ 17.3 min · Decay: β⁻ → ¹⁴⁴Nd · Type: synthetic · Uses: research.
¹⁴⁵Pr — Unstable · t½ ≈ 5.98 h · Decay: β⁻ → ¹⁴⁵Nd · Type: synthetic · Uses: research.
¹⁴⁶Pr — Unstable · t½ ≈ 24.1 min · Decay: β⁻ → ¹⁴⁶Nd · Type: synthetic · Uses: research.
¹⁴⁷Pr — Unstable · t½ ≈ 13.4 min · Decay: β⁻ → ¹⁴⁷Nd · Type: synthetic · Uses: research.
¹⁴⁸Pr — Unstable · t½ ≈ 2.0 min · Decay: β⁻ → ¹⁴⁸Nd · Type: synthetic · Uses: research.
¹⁴⁹Pr — Unstable · t½ ≈ 2.3 min · Decay: β⁻ → ¹⁴⁹Nd · Type: synthetic · Uses: research.
¹⁵⁰Pr — Unstable · t½ ≈ 2.0 min · Decay: β⁻ → ¹⁵⁰Nd · Type: synthetic · Uses: research.
¹⁵¹Pr — Unstable · t½ ≈ 1.9 min · Decay: β⁻ → ¹⁵¹Nd · Type: synthetic · Uses: research.
¹⁵²Pr — Unstable · t½ ≈ 2.0 min · Decay: β⁻ → ¹⁵²Nd · Type: synthetic · Uses: research.
¹⁵³Pr — Unstable · t½ ≈ 4.0 min · Decay: β⁻ → ¹⁵³Nd · Type: synthetic · Uses: research.
¹⁵⁴Pr — Unstable · t½ ≈ 2.5 min · Decay: β⁻ → ¹⁵⁴Nd · Type: synthetic · Uses: research.
¹⁵⁵Pr — Unstable · t½ ≈ 1.5 min · Decay: β⁻ → ¹⁵⁵Nd · Type: synthetic · Uses: research.
¹⁵⁶Pr — Unstable · t½ ≈ 1.0 min · Decay: β⁻ → ¹⁵⁶Nd · Type: synthetic · Uses: research.
¹⁵⁷Pr — Unstable · t½ ≈ 50 s · Decay: β⁻ → ¹⁵⁷Nd · Type: synthetic · Uses: research.
¹⁵⁸Pr — Unstable · t½ ≈ 40 s · Decay: β⁻ → ¹⁵⁸Nd · Type: synthetic · Uses: research.
¹⁵⁹Pr — Unstable · t½ ≈ 30 s · Decay: β⁻ → ¹⁵⁹Nd · Type: synthetic · Uses: research.
Praseodymium — isotope count: 39 total · Stable: 1 (¹⁴¹Pr) · Unstable: 38.
(Data: IAEA LiveChart, NUBASE2020, ENSDF; notable applications: ¹⁴¹Pr in alloys and magnets, unstable Pr isotopes in reactor monitoring and fundamental nuclear research.)