Nuclide reference
Lu-174m — Lutetium-174m
The half-life of Lu-174m is 142 d. Main decay mode: isomeric transition to Lu-174 (99.38%).
Identification
- Element
- Lutetium (Lu)
- Atomic number Z
- 71
- Mass number A
- 174
- State
- Radioactive
Key quantities
- Half-life
- 142 d
- Specific activity
- 1.955e+14 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 20 TBq / 10 TBq
- D-value (НП-067-24)
- 0.6 TBq
Decay modes
- isomeric transition → Lu-174 — 99.38 %
- β⁺ decay / electron capture → Yb-174 — 0.62 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 54.07 · X-ray line | 34.1 |
| 7.63994 · X-ray line | 20.03 |
| 44.683 | 12.43 |
| 67.058 | 7.249 |
| 272.914 | 0.55 |
| 992.077 | 0.5456 |
| 176.653 | 0.4703 |
| 111.762 | 0.2984 |
| 76.468 | 0.06384 |
| 59.08 | 0.02876 |
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.