Nuclide reference
Eu-149 — Europium-149
The half-life of Eu-149 is 93.1 d. Main decay mode: electron capture to Sm-149 (100%).
Identification
- Element
- Europium (Eu)
- Atomic number Z
- 63
- Mass number A
- 149
- State
- Radioactive
Key quantities
- Half-life
- 93.1 d
- Specific activity
- 3.483e+14 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 20 TBq / 20 TBq
- D-value (НП-067-24)
- 2 TBq
Decay modes
- electron capture → Sm-149 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 40.119 · X-ray line | 40.17 |
| 39.524 · X-ray line | 22.19 |
| 327.526 | 4.03 |
| 277.089 | 3.56 |
| 22.51 | 2.32 |
| 254.566 | 0.636 |
| 506.093 | 0.558 |
| 528.587 | 0.508 |
| 350.016 | 0.367 |
| 558.372 | 0.052 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
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.