Nuclide reference
Sn-123 — Tin-123
The half-life of Sn-123 is 129.2 d. Main decay mode: β⁻ decay to Sb-123 (100%).
Identification
- Element
- Tin (Sn)
- Atomic number Z
- 50
- Mass number A
- 123
- State
- Radioactive
Key quantities
- Half-life
- 129.2 d
- Specific activity
- 3.04e+14 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.8 TBq / 0.6 TBq
- D-value (НП-067-24)
- 7 TBq
Decay modes
- β⁻ decay → Sb-123 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 1,088.64 | 0.6 |
| 1,030.23 | 0.03102 |
| 1,021 | 0.001926 |
| 160.33 | 0.001918 |
| 1,337.44 | 0.000756 |
| 1,181.23 | 0.000294 |
| 1,177.06 | 0.000228 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 1,403.6 | 99.37 |
| 314.95 | 0.6 | |
| 373.37 | 0.031 |
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.