Heavy water D2O is used as a moderator in nuclear reactors and in exchange reactions for the study of reaction mechanisms. In nuclear fission reactors, the neutrons must be slowed down to ensure an effective fission chain reaction occurs. This process of slowing neutrons down is known as moderation, and the material that slows down these neutrons is known as a neutron moderator. Heavy water acts as a moderator.
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Knowing the properties of H2O and D2O, do you think that D2O can be used for drinking purposes?NCERT - Chemistry Part-II