Nuclide reference
Te-129 — Tellurium-129
The half-life of Te-129 is 1.16 h. Main decay mode: β⁻ decay to I-129 (100%).
Identification
- Element
- Tellurium (Te)
- Atomic number Z
- 52
- Mass number A
- 129
- State
- Radioactive
Key quantities
- Half-life
- 1.16 h
- Specific activity
- 7.749e+17 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.7 TBq / 0.6 TBq
- D-value (НП-067-24)
- 1 TBq
Decay modes
- β⁻ decay → I-129 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 27.81 | 16.32 |
| 459.6 | 7.7 |
| 4.27082 · X-ray line | 3.348 |
| 3.92397 · X-ray line | 1.893 |
| 487.39 | 1.417 |
| 278.43 | 0.5667 |
| 1,083.85 | 0.4928 |
| 250.62 | 0.3827 |
| 802.1 | 0.1917 |
| 1,111.64 | 0.191 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 1,475.2 | 89 |
| 1,015.7 | 9.3 | |
| 391.35 | 0.88 | |
| 1,224.6 | 0.56 |
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.