Which of the following is not used as a moderator in nuclear reactor ?
Correct answer: D. Molten sodium
- A. Boron hydride
- B. Light water
- C. Beryllium
- D. Molten sodium
Explanation
Molten sodium is commonly used as a reactor coolant, not as a neutron moderator. Light water, beryllium, and hydrogen-containing moderator materials are used to slow neutrons, although the precise use of boron hydride depends on reactor design.
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