Nuclide reference
Sn-126 — Tin-126
The half-life of Sn-126 is 230,000 years. Main decay mode: β⁻ decay to Sb-126m2 (67%).
Identification
- Element
- Tin (Sn)
- Atomic number Z
- 50
- Mass number A
- 126
- State
- Radioactive
Key quantities
- Half-life
- 230,000 years
- Specific activity
- 456,400,000 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.6 TBq / 0.4 TBq
- D-value (НП-067-24)
- 0.03 TBq
Decay modes
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 414.5 (Sb-126m) | 85.67 |
| 666.1 (Sb-126m) | 85.67 |
| 694.8 (Sb-126m) | 82.25 |
| 87.567 | 37 |
| 26.359 · X-ray line | 15.88 |
| 666.5 (Sb-126) | 13.94 |
| 695 (Sb-126) | 13.94 |
| 414.7 (Sb-126) | 11.66 |
| 64.281 | 9.62 |
| 86.938 | 8.917 |
Includes daughter nuclides in equilibrium: Sb-126m, Sb-126 (yield per decay of Sn-126); the emitting nuclide is in brackets. Equilibrium is reached in about 86 d.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 252.1 | 100 |
| 1,915.2 (Sb-126m) | 82.8 | |
| 1,295 (Sb-126m) | 3.392 | |
| 476.3 (Sb-126) | 4.06 |
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.