Nuclide reference
Au-199 — Gold-199
The half-life of Au-199 is 3.139 d. Main decay mode: β⁻ decay to Hg-199 (100%).
Identification
- Element
- Gold (Au)
- Atomic number Z
- 79
- Mass number A
- 199
- State
- Radioactive
Key quantities
- Half-life
- 3.139 d
- Specific activity
- 7.734e+15 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 10 TBq / 0.6 TBq
- D-value (НП-067-24)
- 0.9 TBq
Decay modes
- β⁻ decay → Hg-199 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 158.379 | 40 |
| 208.205 | 8.72 |
| 70.819 · X-ray line | 8.565 |
| 68.894 · X-ray line | 5.054 |
| 49.8264 | 0.3604 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 293.62 | 72 |
| 243.8 | 21.5 | |
| 452 | 6.5 |
For β⁻ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0.
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.