Effective moderators are those materials which contain

Effective moderators are those materials which contain Correct Answer Light weight atoms

Moderators are made from materials with light nuclei which do not absorb the neutrons but rather slow them down by a series of collisions.
Carbon in the form of graphite is a material used for moderators as is heavy water which is Deuterium an isotope of Hydrogen with an atomic mass of 2 bonded to Oxygen.
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