Nuclide reference
Ra-223 — Radium-223
The half-life of Ra-223 is 11.43 d. Main decay mode: α decay to Rn-219 (100%).
Identification
- Element
- Radium (Ra)
- Atomic number Z
- 88
- Mass number A
- 223
- State
- Radioactive
Key quantities
- Half-life
- 11.43 d
- Specific activity
- 1.895e+15 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.4 TBq / 0.007 TBq
- D-value (НП-067-24)
- 0.1 TBq
Decay modes
- α decay → Rn-219 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 83.789 · X-ray line | 23.98 |
| 81.071 · X-ray line | 14.55 |
| 269.463 | 13.9 |
| 351.07 (Bi-211) | 13.05 |
| 271.23 (Rn-219) | 10.8 |
| 401.81 (Rn-219) | 6.588 |
| 154.208 | 5.699 |
| 323.871 | 3.989 |
| 404.853 (Pb-211) | 3.791 |
| 832.01 (Pb-211) | 3.532 |
Includes daughter nuclides in equilibrium: Rn-219, Po-215, Pb-211, Bi-211, Tl-207 (yield per decay of Ra-223); the emitting nuclide is in brackets. Equilibrium is reached in about 4.2 h. Equilibrium with radon requires a sealed source.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| α | 5,716.2 | 51.6 |
| 6,819.1 (Rn-219) | 79.4 | |
| 7,386.1 (Po-215) | 99.94 | |
| 6,622.9 (Bi-211) | 83.73 | |
| β⁻, E max | 1,367 (Pb-211) | 91.5 |
| 535.05 (Pb-211) | 6.334 | |
| 962.15 (Pb-211) | 1.543 | |
| 1,418 (Tl-207) | 99.71 |
For β⁻ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0.
Related calculators
Other isotopes of this element
Reference data vs computed valuesHalf-life, gamma lines and D-value are reference data (ENDF/B-VIII.0, НП-067-24).Gamma constant Γ is H*(10) at 1 m computed from ICRP-107 spectra (NIST µ_en/ρ, ICRP-74 Table A.21) including short-lived progeny in equilibrium (e.g. Cs-137/Ba-137m, Ra-226 series); specific activity uses molar mass M ≈ mass number A.K-series X-ray energies are from NIST SRD 128 (Deslattes et al., 2003): in ENDF/B-VIII.0 they are given to 1 % and shifted by up to 0.7 keV for heavy elements. L-series lines and all yields are ENDF/B-VIII.0.