Which component of a nuclear reactor slows the speed of the neutron?

Question

Quizplus · Accepted Answer

The moderator is responsible for slowing down the speed of the neutron in a nuclear reactor. A moderator is typically made of a material that has a similar mass to that of a neutron, such as heavy water or graphite. When a neutron collides with a moderator, it slows down and is more likely to be absorbed by a uranium fuel nucleus, allowing the reactor to sustain a chain reaction.

Which Component of a Nuclear Reactor Slows the Speed of the Neutron