Nuclide reference
Te-121m — Tellurium-121m
Te-121m की half-life 164.2 d है। मुख्य decay mode: isomeric transition → Te-121 (88.6%)।
Identification
- तत्व
- Tellurium (Te)
- Atomic number Z
- 52
- Mass number A
- 121
- State
- Radioactive
Key quantities
- Half-life
- 164.2 d
- विशिष्ट गतिविधि
- 2.432e+14 Bq/g
- Gamma constant Γ
- —
- परिवहन के लिए A1 / A2 (SSR-6)
- 5 TBq / 3 TBq
- D-value (НП-067-24)
- 0.1 TBq
Decay modes
- isomeric transition → Te-121 — 88.6 %
- β⁺ decay / electron capture → Sb-121 — 11.4 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 212.189 | 81.51 |
| 573.139 (Te-121) | 80.65 |
| 26.359 (Te-121) · X-ray line | 40.97 |
| 26.111 (Te-121) · X-ray line | 21.96 |
| 507.591 (Te-121) | 17.74 |
| 1,102.15 | 2.538 |
| 470.472 (Te-121) | 1.411 |
| 37.138 | 0.9416 |
| 65.548 (Te-121) | 0.2605 |
| 37.138 (Te-121) | 0.1203 |
Includes daughter nuclides in equilibrium: Te-121 (yield per decay of Te-121m); the emitting nuclide is in brackets. Equilibrium is reached in about 150 d.
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 1 m पर H*(10) है, ICRP-107 spectra (NIST µ_en/ρ, ICRP-74 Table A.21) से गणना की गई, equilibrium में short-lived progeny सहित (जैसे Cs-137/Ba-137m, Ra-226 series); specific activity molar mass M ≈ mass number A का उपयोग करती है।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.