Nuclide reference
Eu-152 — Europium-152
The half-life of Eu-152 is 13.537 years. Main decay mode: β⁺ decay / electron capture to Sm-152 (72.1%).
Identification
- Element
- Europium (Eu)
- Atomic number Z
- 63
- Mass number A
- 152
- State
- Radioactive
Key quantities
- Half-life
- 13.537 years
- Specific activity
- 6.428e+12 Bq/g
- Gamma constant Γ (H*(10))
- 0.1846 µSv·m²/(MBq·h)
- Dose rate, 1 GBq at 1 m
- ≈ 185 µSv/h
- A1 / A2 for transport (SSR-6, НП-053-16)
- 1 TBq / 1 TBq
- D-value (НП-067-24)
- 0.06 TBq
Decay modes
- β⁺ decay / electron capture → Sm-152 — 72.1 %
- β⁻ decay → Gd-152 — 27.9 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 40.119 · X-ray line | 38.49 |
| 121.782 | 28.67 |
| 344.279 | 26.56 |
| 39.524 · X-ray line | 21.17 |
| 1,408.01 | 21.07 |
| 964.079 | 14.65 |
| 1,112.07 | 13.69 |
| 778.904 | 12.96 |
| 1,085.87 | 10.24 |
| 244.698 | 7.607 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 695.62 | 13.78 |
| 1,474.5 | 8.099 | |
| 384.78 | 2.427 | |
| 175.39 | 1.819 | |
| β⁺, E max | 730.52 | 0.011 |
For β⁻ and 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.