Moderating material used in a thermal-reactor should be a ____________________?
Correct answer: C. Poor absorber of neutrons
- A. Good absorber of neutrons
- B. Solid substance
- C. Poor absorber of neutrons
- D. None of these
Explanation
A moderator must slow neutrons efficiently while absorbing as few as possible, so that enough neutrons remain available to sustain the chain reaction. Materials such as light water, heavy water, and graphite are selected for this balance.
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