Nuclide reference
Co-57 — Cobalt-57
Co-57 की half-life 271.74 d है। मुख्य decay mode: electron capture → Fe-57 (100%)।
Identification
- तत्व
- Cobalt (Co)
- Atomic number Z
- 27
- Mass number A
- 57
- State
- Radioactive
Key quantities
- Half-life
- 271.74 d
- विशिष्ट गतिविधि
- 3.119e+14 Bq/g
- Gamma constant Γ (H*(10))
- 0.02091 µSv·m²/(MBq·h)
- Dose rate, 1 GBq at 1 m
- ≈ 20.9 µSv/h
- परिवहन के लिए A1 / A2 (SSR-6)
- 10 TBq / 10 TBq
- D-value (НП-067-24)
- 0.7 TBq
Decay modes
- electron capture → Fe-57 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 122.061 | 85.6 |
| 6.403 · X-ray line | 32.78 |
| 6.39 · X-ray line | 16.72 |
| 136.474 | 10.68 |
| 14.4129 | 9.16 |
| 692.41 | 0.149 |
| 570.09 | 0.0158 |
| 706.54 | 0.005 |
| 339.69 | 0.0037 |
| 352.33 | 0.003 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
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।Dose rate example: point source, no shielding or scatter, Ḣ = Γ·A/r².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.