Ca
Calcium
Z = 20 · Alkaline Earth Metal · 40.1 u
Nuclear Engineering Significance
Major component of concrete used in biological shielding and reactor building structures. Thermal absorption (σ_a = 0.43 b) is low. CaO is also a component of some specialized shielding concretes. Relevant in shielding transport calculations.
Basic properties
- Atomic number (Z)
- 20
- Standard atomic mass
- 40.1 u
- Category
- Alkaline Earth Metal
Isotopes & cross-section data
| Isotope | Mass (A) | Half-life | ZAID | Libraries |
|---|---|---|---|---|
| Ca-40 | 40 | Stable | .80c.71c.70c | |
| Ca-44 | 44 | Stable | .80c.71c.70c |