moderators
In nuclear engineering, a neutron moderator is a medium that reduces the speed of fast neutrons, ideally without capturing any, leaving them as thermal neutrons with only minimal (thermal) kinetic energy. These thermal neutrons are immensely more susceptible than fast neutrons to propagate a nuclear chain reaction of uranium-235 or other fissile isotope by colliding with their atomic nucleus.
"Light water" is the most commonly used moderator (roughly 75% of the world's reactors) although the term is slightly ambiguous, usually meaning natural fresh water, but could also refer to deuterium-depleted water. Solid graphite (20% of reactors) and heavy water (5% of reactors) are the main alternatives.Beryllium has also been used in some experimental types, and hydrocarbons have been suggested as another possibility.
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"Light water" is the most commonly used moderator (roughly 75% of the world's reactors) although the term is slightly ambiguous, usually meaning natural fresh water, but could also refer to deuterium-depleted water. Solid graphite (20% of reactors) and heavy water (5% of reactors) are the main alternatives.Beryllium has also been used in some experimental types, and hydrocarbons have been suggested as another possibility.
View More On Wikipedia.org
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