Nuclide reference
Cf-253 — Californium-253
Cf-253 की half-life 17.81 d है। मुख्य decay mode: β⁻ decay → Es-253 (99.69%)।
Identification
- तत्व
- Californium (Cf)
- Atomic number Z
- 98
- Mass number A
- 253
- State
- Radioactive
Key quantities
- Half-life
- 17.81 d
- विशिष्ट गतिविधि
- 1.072e+15 Bq/g
- Gamma constant Γ
- —
- परिवहन के लिए A1 / A2 (SSR-6)
- 40 TBq / 0.04 TBq
- D-value (НП-067-24)
- 0.4 TBq
Decay modes
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 20.9232 · X-ray line | 11.44 |
| 16.0139 · X-ray line | 10.13 |
| 46.4 | 0.09949 |
Lines of the nuclide itself (ENDF/B-VIII.0).
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| α | 5,980 | 0.2936 |
| 5,920 | 0.01643 | |
| β⁻, E max | 240.6 | 50 |
| 287 | 50 | |
| 891.2 (Cm-249) | 0.2999 |
For β⁻ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0. Includes daughter nuclides in equilibrium: Cm-249 (yield per decay of Cf-253); the emitting nuclide is in brackets. Equilibrium is reached in about 7.5 h.
Related calculators
इसी element के अन्य isotopes
Reference data vs computed valuesHalf-life, gamma lines and D-value are reference data (ENDF/B-VIII.0, НП-067-24).Gamma constant Γ 1 m पर H*(10) है, ICRP-107 spectra (NIST µ_en/ρ, ICRP-74 Table A.21) से गणना की गई, equilibrium में short-lived progeny सहित (जैसे Cs-137/Ba-137m, Ra-226 series); specific activity molar mass M ≈ mass number A का उपयोग करती है।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.