Nuclide reference
Eu-154 — Europium-154
The half-life of Eu-154 is 8.601 years. Main decay mode: β⁻ decay to Gd-154 (99.98%).
Identification
- Element
- Europium (Eu)
- Atomic number Z
- 63
- Mass number A
- 154
- State
- Radioactive
Key quantities
- Half-life
- 8.601 years
- Specific activity
- 9.986e+12 Bq/g
- Gamma constant Γ (H*(10))
- 0.1895 µSv·m²/(MBq·h)
- Dose rate, 1 GBq at 1 m
- ≈ 189 µSv/h
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.9 TBq / 0.6 TBq
- D-value (НП-067-24)
- 0.06 TBq
Decay modes
- β⁻ decay → Gd-154 — 99.98 %
- electron capture → Sm-154 — 0.018 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 123.071 | 40.41 |
| 1,274.43 | 34.83 |
| 723.301 | 20.06 |
| 1,004.76 | 18.01 |
| 42.997 · X-ray line | 13.24 |
| 873.183 | 12.08 |
| 996.29 | 10.48 |
| 42.31 · X-ray line | 7.226 |
| 247.929 | 6.887 |
| 591.755 | 4.95 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 571.29 | 36.3 |
| 249.24 | 28.6 | |
| 841 | 16.8 | |
| 1,845.7 | 10 |
For β⁻ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0.
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.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.