Nuclide reference
Ru-103 — Ruthenium-103
The half-life of Ru-103 is 39.247 d. Main decay mode: β⁻ decay to Rh-103m (98.83%).
Identification
- Element
- Ruthenium (Ru)
- Atomic number Z
- 44
- Mass number A
- 103
- State
- Radioactive
Key quantities
- Half-life
- 39.247 d
- Specific activity
- 1.195e+15 Bq/g
- Gamma constant Γ (H*(10))
- 0.0854 µSv·m²/(MBq·h)
- Dose rate, 1 GBq at 1 m
- ≈ 85.4 µSv/h
- A1 / A2 for transport (SSR-6, НП-053-16)
- 2 TBq / 2 TBq
- D-value (НП-067-24)
- 0.1 TBq
Decay modes
- β⁻ decay → Rh-103m — 98.83 %
- β⁻ decay → Rh-103 — 1.174 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 497.085 | 91 |
| 610.333 | 5.76 |
| 20.216 (Rh-103m) · X-ray line | 4.289 |
| 20.0395 (Rh-103m) · X-ray line | 2.082 |
| 557.057 | 0.8408 |
| 53.286 | 0.4432 |
| 443.81 | 0.3394 |
| 294.964 | 0.2885 |
| 612.094 | 0.1046 |
| 39.755 (Rh-103m) | 0.07046 |
Includes daughter nuclides in equilibrium: Rh-103m (yield per decay of Ru-103); the emitting nuclide is in brackets. Equilibrium is reached in about 6.6 h.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 226.56 | 92 |
| 113.31 | 6.5 | |
| 763.4 | 0.87 | |
| 468.44 | 0.28 |
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.Dose rate example: point source, no shielding or scatter, Ḣ = Γ·A/r².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.