Ordinary water is not used as a moderator because, it___________________?
Correct answer: B. Absorbs neutrons
- A. Has a low absorption cross-section
- B. Absorbs neutrons
- C. Has a low scattering cross-section
- D. Does not absorb neutrons
Explanation
Ordinary water contains hydrogen-1, which has a comparatively high neutron-absorption cross-section and captures neutrons that could sustain the chain reaction. Heavy water is preferred as a moderator because deuterium absorbs far fewer neutrons.
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