Nuclide reference
Tb-157 — Terbium-157
Tb-157 की half-life 71 years है। मुख्य decay mode: electron capture → Gd-157 (100%)।
Identification
- तत्व
- Terbium (Tb)
- Atomic number Z
- 65
- Mass number A
- 157
- State
- Radioactive
Key quantities
- Half-life
- 71 years
- विशिष्ट गतिविधि
- 1.187e+12 Bq/g
- Gamma constant Γ
- —
- परिवहन के लिए A1 / A2 (SSR-6)
- 40 TBq / 40 TBq
- D-value (НП-067-24)
- 100 TBq
Decay modes
- electron capture → Gd-157 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 6.7752 · X-ray line | 13.27 |
| 42.997 · X-ray line | 7.691 |
| 54.5 | 0.0084 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
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.