Nuclide reference
Ir-194 — Iridium-194
The half-life of Ir-194 is 19.28 h. Main decay mode: β⁻ decay to Pt-194 (100%).
Identification
- Element
- Iridium (Ir)
- Atomic number Z
- 77
- Mass number A
- 194
- State
- Radioactive
Key quantities
- Half-life
- 19.28 h
- Specific activity
- 3.1e+16 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 → Pt-194 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 328.448 | 13.1 |
| 293.541 | 2.515 |
| 645.146 | 1.175 |
| 1,150.75 | 0.6013 |
| 938.69 | 0.5987 |
| 66.831 · X-ray line | 0.4284 |
| 300.741 | 0.3485 |
| 621.971 | 0.3341 |
| 1,183.49 | 0.3065 |
| 65.123 · X-ray line | 0.2506 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 2,228.8 | 85.4 |
| 1,900.4 | 9.3 | |
| 961.66 | 1.77 | |
| 1,606.8 | 1.28 |
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.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.