Moderator

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Moderator

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A material that has a high cross section for slowing down fast neutrons with a minimum of absorption, e.g., heavy water, beryllium, used in reactor cores. </dd>
Moderators are used to improve the neutron utilization by slowing the neutrons to low energies, thereby increasing the probability of fission capture in the nuclear fuel. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use