How does neutron cross-section influence shielding and reactor design?

How does neutron cross-section influence shielding and reactor design?

• A. A larger cross-section increases probability of interaction, affecting shielding thickness and reactivity control.
• B. Cross-section only affects heat transfer properties, not shielding.
• C. A smaller cross-section always makes materials better neutron absorbers.
• D. It has no practical impact on shielding or reactor control.

Answer: (A)