In a nuclear reactor, the moderator is a material (like heavy water, light water, or graphite) used to slow down fast neutrons produced in fission reactions. Slower neutrons (thermal neutrons) are more likely to induce further fission in fissile material, sustaining the chain reaction. Moderators do not absorb or stop neutrons—their role is to reduce neutron speed.
Choose the correct statement for a nuclear reactor?
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