General | |
---|---|
Symbol | 223Ra |
Names | radium-223, 223Ra, Ra-223, actinium X, AcX |
Protons (Z) | 88 |
Neutrons (N) | 135 |
Nuclide data | |
Half-life (t1/2) | 11.43±0.05 d |
Isotope mass | 223.0185007(22) Da |
Parent isotopes | 227Th 223Fr |
Decay products | 219Rn |
Decay modes | |
Decay mode | Decay energy (MeV) |
α | 5.979[1] |
Isotopes of radium Complete table of nuclides |
Radium-223 (223Ra, Ra-223) is an isotope of radium with an 11.4-day half-life. It was discovered in 1905 by T. Godlewski,[2][3][4] a Polish chemist from Kraków, and was historically known as actinium X (AcX).[5][6] Radium-223 dichloride is an alpha particle-emitting radiotherapy drug that mimics calcium and forms complexes with hydroxyapatite at areas of increased bone turnover.[7] The principal use of radium-223, as a radiopharmaceutical to treat metastatic cancers in bone, takes advantage of its chemical similarity to calcium, and the short range of the alpha radiation it emits.[8]
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