Nuclide reference
As-73 — Arsenic-73
The half-life of As-73 is 80.3 d. Main decay mode: electron capture to Ge-73m (100%).
Identification
- Element
- Arsenic (As)
- Atomic number Z
- 33
- Mass number A
- 73
- State
- Radioactive
Key quantities
- Half-life
- 80.3 d
- Specific activity
- 8.242e+14 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 40 TBq / 40 TBq
- D-value (НП-067-24)
- 40 TBq
Decay modes
- electron capture → Ge-73m — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 9.887 (Ge-73m) · X-ray line | 33.02 |
| 9.887 · X-ray line | 27.21 |
| 53.53 (Ge-73m) | 10.67 |
| 13.06 (Ge-73m) | 0.08842 |
Includes daughter nuclides in equilibrium: Ge-73m (yield per decay of As-73); the emitting nuclide is in brackets. Equilibrium is reached in about 3.5 s.
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.