Nuclide reference
Ba-140 — Barium-140
The half-life of Ba-140 is 12.753 d. Main decay mode: β⁻ decay to La-140 (100%).
Identification
- Element
- Barium (Ba)
- Atomic number Z
- 56
- Mass number A
- 140
- State
- Radioactive
Key quantities
- Half-life
- 12.753 d
- Specific activity
- 2.706e+15 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.5 TBq / 0.3 TBq
- D-value (НП-067-24)
- 0.03 TBq
Decay modes
- β⁻ decay → La-140 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 1,596.21 (La-140) | 109.9 |
| 487.021 (La-140) | 52.4 |
| 815.772 (La-140) | 26.81 |
| 537.261 | 24.39 |
| 328.762 (La-140) | 23.4 |
| 29.966 | 14.1 |
| 5.09936 · X-ray line | 8.065 |
| 925.189 (La-140) | 7.943 |
| 867.846 (La-140) | 6.339 |
| 162.66 | 6.219 |
Includes daughter nuclides in equilibrium: La-140 (yield per decay of Ba-140); the emitting nuclide is in brackets. Equilibrium is reached in about 14 d. In transient equilibrium a daughter's activity exceeds the parent's, so a yield can be above 100%.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 1,006.2 | 38 |
| 1,020 | 24 | |
| 468.93 | 23.8 | |
| 1,350.2 (La-140) | 50.55 |
For β⁻ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0.
Related calculators
Other isotopes of this element
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.