Elements · ← Fr Francium · Ac Actinium →
Radium-223 is an alpha emitter that seeks out bone.
| Symbol | Ra |
|---|---|
| Atomic number | 88 |
| Atomic mass | 226.02541(no standard atomic weight: the element has no stable isotopes or characteristic natural composition; PubChem lists this isotope mass) |
| Group | 2 |
| Period | 7 |
| Block | s-block |
| Category | Alkaline earth metal |
| Standard state | Solid |
| Discovered | 1898 |
Source: PubChem, Radium (periodic table data, retrieved 2026-10-19). Group and period follow the standard 18-column periodic table.
In a phase 3 trial in 921 men with castration-resistant prostate cancer and bone metastases, the alpha emitter radium-223 improved median overall survival to 14.9 months versus 11.3 months with placebo.
Built / tested: radium-223 dichloride
As reported in: Parker, Nilsson, Heinrich et al. (2013). Alpha Emitter Radium-223 and Survival in Metastatic Prostate Cancer. New England Journal of Medicine. doi:10.1056/nejmoa1213755
Abstract only
Found by name, common compounds and chemical formulas in each entry.
Search Google Patents for radium in biological and medical uses: all patents · recent applications (2022+)
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