²⁰¹Ra — Unstable · t½ ≈ 1.0 ms · Decay: α → ¹⁹⁷Rn · Type: synthetic · Uses: research.
²⁰²Ra — Unstable · t½ ≈ 5.0 ms · Decay: α → ¹⁹⁸Rn · Type: synthetic · Uses: research.
²⁰³Ra — Unstable · t½ ≈ 10.0 ms · Decay: α → ¹⁹⁹Rn · Type: synthetic · Uses: research.
²⁰⁴Ra — Unstable · t½ ≈ 20.0 ms · Decay: α → ²⁰⁰Rn · Type: synthetic · Uses: research.
²⁰⁵Ra — Unstable · t½ ≈ 45.0 ms · Decay: α → ²⁰¹Rn · Type: synthetic · Uses: research.
²⁰⁶Ra — Unstable · t½ ≈ 0.2 s · Decay: α → ²⁰²Rn · Type: synthetic · Uses: research.
²⁰⁷Ra — Unstable · t½ ≈ 0.5 s · Decay: α → ²⁰³Rn · Type: synthetic · Uses: research.
²⁰⁸Ra — Unstable · t½ ≈ 1.2 s · Decay: α → ²⁰⁴Rn · Type: synthetic · Uses: research.
²⁰⁹Ra — Unstable · t½ ≈ 3.0 s · Decay: α → ²⁰⁵Rn · Type: synthetic · Uses: research.
²¹⁰Ra — Unstable · t½ ≈ 3.7 s · Decay: α → ²⁰⁶Rn · Type: synthetic · Uses: research.
²¹¹Ra — Unstable · t½ ≈ 13.0 s · Decay: α → ²⁰⁷Rn · Type: synthetic · Uses: research.
²¹²Ra — Unstable · t½ ≈ 13.0 s · Decay: α → ²⁰⁸Rn · Type: synthetic · Uses: research.
²¹³Ra — Unstable · t½ ≈ 2.7 min · Decay: α → ²⁰⁹Rn · Type: synthetic · Uses: research.
²¹⁴Ra — Unstable · t½ ≈ 2.4 s · Decay: α → ²¹⁰Rn · Type: synthetic · Uses: research.
²¹⁵Ra — Unstable · t½ ≈ 2.5 s · Decay: α → ²¹¹Rn · Type: synthetic · Uses: research.
²¹⁶Ra — Unstable · t½ ≈ 182 ms · Decay: α → ²¹²Rn · Type: synthetic · Uses: research.
²¹⁷Ra — Unstable · t½ ≈ 1.6 s · Decay: α → ²¹³Rn · Type: synthetic · Uses: research.
²¹⁸Ra — Unstable · t½ ≈ 25.0 ms · Decay: α → ²¹⁴Rn · Type: synthetic · Uses: research.
²¹⁹Ra — Unstable · t½ ≈ 10.0 ms · Decay: α → ²¹⁵Rn · Type: synthetic · Uses: research.
²²⁰Ra — Unstable · t½ ≈ 18.0 ms · Decay: α → ²¹⁶Rn · Type: synthetic · Uses: research.
²²¹Ra — Unstable · t½ ≈ 28.0 s · Decay: α → ²¹⁷Rn · Type: synthetic · Uses: research.
²²²Ra — Unstable · t½ ≈ 38.0 s · Decay: α → ²¹⁸Rn · Type: synthetic · Uses: research.
²²³Ra — Unstable · t½ ≈ 11.4 d · Decay: α → ²¹⁹Rn · Type: medical isotope · Uses: α-therapy (bone metastases).
²²⁴Ra — Unstable · t½ ≈ 3.6 d · Decay: α → ²²⁰Rn · Type: natural (Thorium series) · Uses: tracer.
²²⁵Ra — Unstable · t½ ≈ 14.9 d · Decay: β⁻ → ²²⁵Ac · Type: medical isotope · Uses: targeted radiotherapy.
²²⁶Ra — Unstable · t½ ≈ 1600 y · Decay: α → ²²²Rn · Type: natural (Uranium series) · Uses: radiotherapy, industrial radiography.
²²⁷Ra — Unstable · t½ ≈ 42.2 min · Decay: β⁻ → ²²⁷Ac · Type: natural (Actinium series) · Uses: tracer.
²²⁸Ra — Unstable · t½ ≈ 5.75 y · Decay: β⁻ → ²²⁸Ac · Type: natural (Thorium series) · Uses: environmental tracer.
²²⁹Ra — Unstable · t½ ≈ 4.0 min · Decay: β⁻ → ²²⁹Ac · Type: synthetic · Uses: research.
²³⁰Ra — Unstable · t½ ≈ 93.0 min · Decay: β⁻ → ²³⁰Ac · Type: synthetic · Uses: research.
²³¹Ra — Unstable · t½ ≈ 104 s · Decay: β⁻ → ²³¹Ac · Type: synthetic · Uses: research.
²³²Ra — Unstable · t½ ≈ 4.2 h · Decay: β⁻ → ²³²Ac · Type: synthetic · Uses: research.
²³³Ra — Unstable · t½ ≈ 30.0 min · Decay: β⁻ → ²³³Ac · Type: synthetic · Uses: research.
²³⁴Ra — Unstable · t½ ≈ 30.7 min · Decay: β⁻ → ²³⁴Ac · Type: synthetic · Uses: research.
Radium — isotope count: 34 total · Stable: none · Unstable: 34.
(Data: IAEA LiveChart, NUBASE2020, ENSDF; notable applications: ²²⁶Ra in radiotherapy & radiography, ²²³Ra and ²²⁵Ra in targeted α-therapy, ²²⁸Ra as environmental tracer.)
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