Nuclide reference
Pd-103 — Palladium-103
The half-life of Pd-103 is 16.991 d. Main decay mode: electron capture to Rh-103m (99.92%).
Identification
- Element
- Palladium (Pd)
- Atomic number Z
- 46
- Mass number A
- 103
- State
- Radioactive
Key quantities
- Half-life
- 16.991 d
- Specific activity
- 2.761e+15 Bq/g
- Gamma constant Γ (H*(10))
- 0.02012 µSv·m²/(MBq·h)
- Dose rate, 1 GBq at 1 m
- ≈ 20.1 µSv/h
- A1 / A2 for transport (SSR-6, НП-053-16)
- 40 TBq / 40 TBq
- D-value (НП-067-24)
- 90 TBq
Decay modes
- electron capture → Rh-103m — 99.92 %
- electron capture → Rh-103 — 0.07523 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 20.216 · X-ray line | 38.61 |
| 20.0395 · X-ray line | 19.3 |
| 39.755 (Rh-103m) | 0.07134 |
| 357.45 | 0.02206 |
| 497.08 | 0.003961 |
| 294.98 | 0.0028 |
| 62.41 | 0.001038 |
Includes daughter nuclides in equilibrium: Rh-103m (yield per decay of Pd-103); the emitting nuclide is in brackets. Equilibrium is reached in about 6.6 h.
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.