Nuclide reference
Fe-55 — Iron-55
The half-life of Fe-55 is 2.744 years. Main decay mode: electron capture to Mn-55 (100%).
Identification
- Element
- Iron (Fe)
- Atomic number Z
- 26
- Mass number A
- 55
- State
- Radioactive
Key quantities
- Half-life
- 2.744 years
- Specific activity
- 8.764e+13 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 40 TBq / 40 TBq
- D-value (НП-067-24)
- 800 TBq
Decay modes
- electron capture → Mn-55 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 5.898 · X-ray line | 16.36 |
| 5.886 · X-ray line | 8.345 |
| 6.493 · X-ray line | 1.957 |
| 6.485 · X-ray line | 0.9945 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
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.