Source: wikibot/neutron-moderators
= Neutron moderators
{wiki=Neutron_moderators}
Neutron moderators are materials used in nuclear reactors to slow down fast neutrons produced during fission processes, making them more likely to interact with fissile material (such as uranium-235 or plutonium-239) and sustain a chain reaction. Fast neutrons have high kinetic energy and are less likely to cause fission when they collide with fuel nuclei, so slowing them down increases the probability of further reactions.