Moderator Definition

Definition: A moderator is a material that slows the speed of neutrons.

Moderators are used in nuclear reactors to slow the neutrons enough to increase the likelihood of interaction with another nucleus to initiate fission.

Also Known As: neutron moderator

Examples: Water, graphite and heavy water are all commonly used moderators in nuclear reactors.

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Helmenstine, Anne Marie, Ph.D. "Moderator Definition." ThoughtCo, Jun. 11, 2014, Helmenstine, Anne Marie, Ph.D. (2014, June 11). Moderator Definition. Retrieved from Helmenstine, Anne Marie, Ph.D. "Moderator Definition." ThoughtCo. (accessed March 22, 2018).