Nuclide reference
Os-194 — Osmium-194
The half-life of Os-194 is 6 years. Main decay mode: β⁻ decay to Ir-194 (100%).
Identification
- Element
- Osmium (Os)
- Atomic number Z
- 76
- Mass number A
- 194
- State
- Radioactive
Key quantities
- Half-life
- 6 years
- Specific activity
- 1.136e+13 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.3 TBq / 0.3 TBq
- D-value (НП-067-24)
- 0.7 TBq
Decay modes
- β⁻ decay → Ir-194 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 328.448 (Ir-194) | 13.1 |
| 9.16129 · X-ray line | 9.211 |
| 10.7723 · X-ray line | 6.786 |
| 43.1 | 5.4 |
| 293.541 (Ir-194) | 2.516 |
| 645.146 (Ir-194) | 1.176 |
| 1,150.75 (Ir-194) | 0.6015 |
| 938.69 (Ir-194) | 0.5989 |
| 300.741 (Ir-194) | 0.3486 |
| 621.971 (Ir-194) | 0.3342 |
Includes daughter nuclides in equilibrium: Ir-194 (yield per decay of Os-194); the emitting nuclide is in brackets. Equilibrium is reached in about 5.6 d.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 53.5 | 76 |
| 96.6 | 24 | |
| 2,228.8 (Ir-194) | 85.43 | |
| 1,900.4 (Ir-194) | 9.303 |
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.