Nuclide reference
Te-131 — Tellurium-131
The half-life of Te-131 is 25 min. Main decay mode: β⁻ decay to I-131 (100%).
Identification
- Element
- Tellurium (Te)
- Atomic number Z
- 52
- Mass number A
- 131
- State
- Radioactive
Key quantities
- Half-life
- 25 min
- Specific activity
- 2.124e+18 Bq/g
- Gamma constant Γ
- —
- D-value (НП-067-24)
- —
Decay modes
- β⁻ decay → I-131 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 149.716 | 68.8 |
| 452.323 | 18.2 |
| 28.612 · X-ray line | 6.843 |
| 1,146.96 | 4.954 |
| 492.66 | 4.83 |
| 602.039 | 4.19 |
| 28.318 · X-ray line | 3.685 |
| 997.25 | 3.337 |
| 948.542 | 2.257 |
| 654.26 | 1.527 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 2,083.1 | 59.3 |
| 1,630.8 | 21.64 | |
| 1,085.9 | 10 | |
| 1,134.5 | 2.58 |
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.