Nuclide reference
Ta-178 — Tantalum-178
The half-life of Ta-178 is 9.31 min. Main decay mode: β⁺ decay / electron capture to Hf-178 (100%).
Identification
- Element
- Tantalum (Ta)
- Atomic number Z
- 73
- Mass number A
- 178
- State
- Radioactive
Key quantities
- Half-life
- 9.31 min
- Specific activity
- 4.198e+18 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 1 TBq / 0.8 TBq
- D-value (НП-067-24)
- —
Decay modes
- β⁺ decay / electron capture → Hf-178 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 55.784 · X-ray line | 42.68 |
| 54.606 · X-ray line | 24.4 |
| 93.13 | 6.576 |
| 510.999 · annihilation 511 keV | 2.48 |
| 1,350.55 | 1.176 |
| 1,340.85 | 1.027 |
| 1,106.09 | 0.5357 |
| 1,402.87 | 0.48 |
| 1,496.01 | 0.2688 |
| 1,183.38 | 0.1694 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁺, E max | 915 | 0.9 |
| 821.86 | 0.34 |
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.