Nuclide reference
Gd-146 — Gadolinium-146
The half-life of Gd-146 is 48.27 d. Main decay mode: β⁺ decay / electron capture to Eu-146 (100%).
Identification
- Element
- Gadolinium (Gd)
- Atomic number Z
- 64
- Mass number A
- 146
- State
- Radioactive
Key quantities
- Half-life
- 48.27 d
- Specific activity
- 6.855e+14 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.5 TBq / 0.5 TBq
- D-value (НП-067-24)
- 0.03 TBq
Decay modes
- β⁺ decay / electron capture → Eu-146 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 747.159 (Eu-146) | 108.9 |
| 41.543 · X-ray line | 94.5 |
| 40.904 · X-ray line | 52.25 |
| 634.137 (Eu-146) | 49.74 |
| 154.57 | 46.6 |
| 114.71 | 44.04 |
| 115.51 | 44.04 |
| 633.083 (Eu-146) | 39.62 |
| 510.999 (Eu-146) · annihilation 511 keV | 10.27 |
| 665.424 (Eu-146) | 7.99 |
Includes daughter nuclides in equilibrium: Eu-146 (yield per decay of Gd-146); the emitting nuclide is in brackets. Equilibrium is reached in about 36 d. In transient equilibrium a daughter's activity exceeds the parent's, so a yield can be above 100%.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁺, E max | 1,477.7 (Eu-146) | 2.475 |
| 1,476.7 (Eu-146) | 2.21 | |
| 812.31 (Eu-146) | 0.1989 | |
| 1,046.3 (Eu-146) | 0.1193 |
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.