¹⁸Na — Unstable · t½ ≈ 1.3 s · Decay: β⁺ → ¹⁸Ne · Type: synthetic · Uses: research only.
¹⁹Na — Unstable · t½ ≈ 17.3 ms · Decay: β⁺ → ¹⁹Ne · Type: synthetic · Uses: nuclear-structure tests.
²⁰Na — Unstable · t½ ≈ 447 ms · Decay: β⁺ → ²⁰Ne · Type: synthetic · Uses: β-decay studies.
²¹Na — Unstable · t½ ≈ 22.5 s · Decay: β⁺ → ²¹Ne · Type: synthetic · Uses: tracer in metabolic research.
²²Na — Unstable · t½ ≈ 2.6 y · Decay: β⁺/EC → ²²Ne (γ 1.275 MeV) · Type: cosmogenic/synthetic · Uses: PET calibration source; γ-ray source.
²³Na — Stable · — · Type: stable (primordial) · Uses: industrial sodium, biological essential element, ²³Na-MRI.
²⁴Na — Unstable · t½ ≈ 15 h · Decay: β⁻ → ²⁴Mg (γ 2.75 MeV) · Type: activation product · Uses: reactor coolant monitoring.
²⁵Na — Unstable · t½ ≈ 59 s · Decay: β⁻ → ²⁵Mg · Type: synthetic · Uses: research.
²⁶Na — Unstable · t½ ≈ 1.07 s · Decay: β⁻ → ²⁶Mg · Type: synthetic · Uses: research.
²⁷Na — Unstable · t½ ≈ 301 ms · Decay: β⁻ → ²⁷Mg · Type: synthetic · Uses: research.
²⁸Na — Unstable · t½ ≈ 30 ms · Decay: β⁻ → ²⁸Mg · Type: synthetic · Uses: research.
²⁹Na — Unstable · t½ ≈ 44 ms · Decay: β⁻ (βn) → Mg isotopes · Type: synthetic · Uses: research.
³⁰Na — Unstable · t½ ≈ 48 ms · Decay: β⁻ (βn) · Type: synthetic · Uses: research.
³¹Na — Unstable · t½ ≈ 17 ms · Decay: β⁻ (βn) · Type: synthetic · Uses: research.
³²Na — Unstable · t½ ≈ 13 ms · Decay: β⁻ (βn) · Type: synthetic · Uses: research.
³³Na — Unstable · t½ ≈ 8 ms · Decay: β⁻ (βn) · Type: synthetic · Uses: research.
³⁴Na — Unstable · t½ ≈ 5 ms · Decay: β⁻ (βn) · Type: synthetic · Uses: research.
³⁵Na — Unstable · t½ ≈ 2.3 ms · Decay: β⁻ (βn) · Type: synthetic · Uses: research.
³⁶Na — Unstable · t½ ≈ 1.5 ms · Decay: β⁻ (βn) · Type: synthetic · Uses: research.
³⁷Na — Unstable · t½ ≈ 1.1 ms · Decay: β⁻ (βn) · Type: synthetic · Uses: research.
Sodium — isotope count: 20 total · Stable: 1 (²³Na) · Unstable: 19.
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