Nuclide reference
Fr-223 — Francium-223
The half-life of Fr-223 is 22 min. Main decay mode: β⁻ decay to Ra-223 (99.99%).
Identification
- Element
- Francium (Fr)
- Atomic number Z
- 87
- Mass number A
- 223
- State
- Radioactive
Key quantities
- Half-life
- 22 min
- Specific activity
- 1.418e+18 Bq/g
- Gamma constant Γ
- —
- D-value (НП-067-24)
- —
Decay modes
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 50.094 | 33.9 |
| 79.651 | 8.699 |
| 234.75 | 3 |
| 49.8 | 2.79 |
| 20.27 | 1.59 |
| 15.1468 · X-ray line | 1.078 |
| 204.9 | 0.9779 |
| 100.134 · X-ray line | 0.5695 |
| 134.59 | 0.531 |
| 319.26 | 0.489 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 1,099.1 | 70 |
| 1,069.5 | 15 | |
| 914.42 | 10.1 | |
| 779.85 | 1.7 |
For β⁻ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0.
Related calculators
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.