Nuclide reference
Cf-249 — Californium-249
The half-life of Cf-249 is 351 years. Main decay mode: α decay to Cm-245 (100%).
Identification
- Element
- Californium (Cf)
- Atomic number Z
- 98
- Mass number A
- 249
- State
- Radioactive
Key quantities
- Half-life
- 351 years
- Specific activity
- 1.513e+11 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 3 TBq / 0.0008 TBq
- D-value (НП-067-24)
- 0.1 TBq
Decay modes
- α decay → Cm-245 — 100 %
- spontaneous fission — 5.2e-7 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 388.17 | 66 |
| 333.37 | 14.98 |
| 19.1522 · X-ray line | 6.9 |
| 14.9561 · X-ray line | 6.772 |
| 252.82 | 2.587 |
| 266.63 | 0.7194 |
| 92.51 | 0.3036 |
| 240.89 | 0.2158 |
| 54.77 | 0.1518 |
| 295.73 | 0.1406 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| α | 5,813.3 | 82.2 |
| 5,759.5 | 4.69 | |
| 5,946 | 3.33 | |
| 5,903.2 | 3.21 |
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.