Nuclide reference
Pd-109 — Palladium-109
The half-life of Pd-109 is 13.701 h. Main decay mode: β⁻ decay to Ag-109m (99.95%).
Identification
- Element
- Palladium (Pd)
- Atomic number Z
- 46
- Mass number A
- 109
- State
- Radioactive
Key quantities
- Half-life
- 13.701 h
- Specific activity
- 7.764e+16 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 2 TBq / 0.5 TBq
- D-value (НП-067-24)
- 20 TBq
Decay modes
- β⁻ decay → Ag-109m — 99.95 %
- β⁻ decay → Ag-109 — 0.04846 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 22.163 (Ag-109m) · X-ray line | 19.07 |
| 21.991 (Ag-109m) · X-ray line | 10.12 |
| 88.0336 (Ag-109m) | 3.701 |
| 311.4 | 0.03196 |
| 647.3 | 0.0244 |
| 781.4 | 0.01122 |
| 415.2 | 0.01074 |
| 636.3 | 0.00998 |
| 602.5 | 0.007979 |
| 413 | 0.006588 |
Includes daughter nuclides in equilibrium: Ag-109m (yield per decay of Pd-109); the emitting nuclide is in brackets. Equilibrium is reached in about 4.6 min.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 1,027.9 | 99.9 |
| 380.6 | 0.032 | |
| 391.5 | 0.021 | |
| 804.5 | 0.02 |
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.