Nuclide reference
Ta-179 — Tantalum-179
The half-life of Ta-179 is 1.82 years. Main decay mode: electron capture to Hf-179 (100%).
Identification
- Element
- Tantalum (Ta)
- Atomic number Z
- 73
- Mass number A
- 179
- State
- Radioactive
Key quantities
- Half-life
- 1.82 years
- Specific activity
- 4.06e+13 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 30 TBq / 30 TBq
- D-value (НП-067-24)
- 6 TBq
Decay modes
- electron capture → Hf-179 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 55.784 · X-ray line | 22.42 |
| 54.606 · X-ray line | 12.69 |
| 7.88378 · X-ray line | 9.777 |
| 9.10306 · X-ray line | 8.666 |
| 63.237 · X-ray line | 4.614 |
| 62.981 · X-ray line | 2.387 |
| 10.6819 · X-ray line | 1.5 |
| 64.965 · X-ray line | 1.039 |
| 6.96785 · X-ray line | 0.785 |
| 64.907 · X-ray line | 0.5369 |
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 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.