Nuclide reference
Sb-122 — Antimony-122
The half-life of Sb-122 is 2.7238 d. Main decay mode: β⁻ decay to Te-122 (97.59%).
Identification
- Element
- Antimony (Sb)
- Atomic number Z
- 51
- Mass number A
- 122
- State
- Radioactive
Key quantities
- Half-life
- 2.7238 d
- Specific activity
- 1.454e+16 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 → Te-122 — 97.59 %
- β⁺ decay / electron capture → Sn-122 — 2.41 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 564.24 | 70.67 |
| 692.65 | 3.852 |
| 25.271 · X-ray line | 0.9635 |
| 1,256.93 | 0.8128 |
| 1,140.67 | 0.7563 |
| 25.044 · X-ray line | 0.515 |
| 793.3 | 0.01626 |
| 510.999 · annihilation 511 keV | 0.01225 |
| 615 | 0.01131 |
| 1,752.4 | 0.009188 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 1,419.6 | 66.73 |
| 1,983.9 | 26.07 | |
| 726.98 | 4.595 | |
| 231.6 | 0.01398 |
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.