Nuclide reference
Sn-125 — Tin-125
The half-life of Sn-125 is 9.64 d. Main decay mode: β⁻ decay to Sb-125 (100%).
Identification
- Element
- Tin (Sn)
- Atomic number Z
- 50
- Mass number A
- 125
- State
- Radioactive
Key quantities
- Half-life
- 9.64 d
- Specific activity
- 4.009e+15 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.4 TBq / 0.4 TBq
- D-value (НП-067-24)
- 0.1 TBq
Decay modes
- β⁻ decay → Sb-125 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 1,067.1 | 9.7 |
| 1,089.15 | 4.588 |
| 822.48 | 4.278 |
| 915.55 | 4.132 |
| 2,002.13 | 1.921 |
| 469.85 | 1.484 |
| 332.1 | 1.406 |
| 1,087.7 | 1.193 |
| 800.28 | 1.067 |
| 1,419.7 | 0.4869 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 2,357 | 81.4 |
| 467.14 | 6.6 | |
| 374.14 | 4.3 | |
| 1,267.5 | 3 |
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.