A moderator in a nuclear reactor is used to slow down fast-moving neutrons, making them more likely to cause fission in fissile materials like uranium-235. Heavy water (D₂O) is an effective moderator because it slows down neutrons without absorbing them. Graphite and ordinary water (H₂O) can also be used, but heavy water is more efficient in certain types of reactors (e.g., CANDU reactors).
Which is used as moderator in atomic reactor?
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