Nuclide reference
Sm-151 — Samarium-151
The half-life of Sm-151 is 90 years. Main decay mode: β⁻ decay to Eu-151 (100%).
Identification
- Element
- Samarium (Sm)
- Atomic number Z
- 62
- Mass number A
- 151
- State
- Radioactive
Key quantities
- Half-life
- 90 years
- Specific activity
- 9.733e+11 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 40 TBq / 10 TBq
- D-value (НП-067-24)
- 500 TBq
Decay modes
- β⁻ decay → Eu-151 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 6.51521 · X-ray line | 0.06604 |
| 5.82801 · X-ray line | 0.03712 |
| 21.543 | 0.0318 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 76.6 | 99.09 |
| 55.057 | 0.91 |
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.