A control rod________________?
Correct answer: D. Both B. and C.
- A. Should have small absorption cross-section
- B. Is generally made of boron, hafnium or cadmium
- C. Should have large absorption cross-section
- D. Both B. and C.
Explanation
Control rods must strongly absorb neutrons to regulate or stop the chain reaction, so they require a large absorption cross-section. Boron, hafnium and cadmium are common neutron-absorbing materials, making both statements B and C correct.
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