What substance can be used in nuclear reactors as neutron moderators?

Neutron moderators are substances that reduce the kinetic energy that free neutrons release as a result of their collisions with the atomic nuclei of matter. The neutron moderation process is widely used in nuclear reactors.

Water, heavy water, graphite and beryllium are recognized as some of the best substitutes for neutrons. In such absorbers, neutrons lose a large amount of energy when they collide with nuclei.

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