Mn
Manganese
Z = 25 · Transition Metal · 54.9 u
Nuclear Engineering Significance
Alloying element in reactor steels and stainless steels. Thermal absorption (σ_a = 13.3 b) is relatively high, making it a parasitic absorber. Mn-54 (t₁/₂ = 312 d) and Mn-56 (t₁/₂ = 2.58 h) are significant activation products in structural materials.
Basic properties
- Atomic number (Z)
- 25
- Standard atomic mass
- 54.9 u
- Category
- Transition Metal
Isotopes & cross-section data
| Isotope | Mass (A) | Half-life | ZAID | Libraries |
|---|---|---|---|---|
| Mn-55 | 55 | Stable | .80c.71c.70c |