La
Lanthanum
Z = 57 · Lanthanide · 138.9 u
Nuclear Engineering Significance
Fission product. La-140 (t₁/₂ = 1.68 d, strong gamma emitter) is a key nuclide for post-irradiation fission rate measurements. Lanthanum oxide is occasionally used in reactor glass and ceramic formulations.
Basic properties
- Atomic number (Z)
- 57
- Standard atomic mass
- 138.9 u
- Category
- Lanthanide
Isotopes & cross-section data
| Isotope | Mass (A) | Half-life | ZAID | Libraries |
|---|---|---|---|---|
| La-139 | 139 | Stable | .80c.71c |