Nuclide reference
Co-56 — Cobalt-56
The half-life of Co-56 is 77.233 d. Main decay mode: β⁺ decay / electron capture to Fe-56 (100%).
Identification
- Element
- Cobalt (Co)
- Atomic number Z
- 27
- Mass number A
- 56
- State
- Radioactive
Key quantities
- Half-life
- 77.233 d
- Specific activity
- 1.117e+15 Bq/g
- Gamma constant Γ (H*(10))
- 0.4909 µSv·m²/(MBq·h)
- Dose rate, 1 GBq at 1 m
- ≈ 491 µSv/h
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.3 TBq / 0.3 TBq
- D-value (НП-067-24)
- 0.02 TBq
Decay modes
- β⁺ decay / electron capture → Fe-56 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 846.771 | 99.94 |
| 1,238.28 | 66.9 |
| 510.999 · annihilation 511 keV | 38.05 |
| 2,598.46 | 17.3 |
| 1,771.35 | 15.47 |
| 6.403 · X-ray line | 14.58 |
| 1,037.84 | 14.17 |
| 3,253.42 | 8.12 |
| 2,034.76 | 7.89 |
| 6.39 · X-ray line | 7.441 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁺, E max | 1,458.9 | 18.1 |
| 421.07 | 0.9 | |
| 584.07 | 0.017 |
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.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.