What characteristic is preferred in the elements contained in moderator materials when used in a nuclear fission reactor?
A) low atomic mass
B) metallic
C) non-metallic
D) high atomic mass

Question

Quizplus · Accepted Answer

The preferred characteristic in a moderator material for a nuclear fission reactor is a low atomic mass. This is because a low atomic mass material slows down the neutrons produced during fission reactions, allowing them to be more easily absorbed by other uranium atoms and sustain the chain reaction. Examples of materials with low atomic mass commonly used as moderators include water, heavy water (deuterium oxide), and graphite.

What Characteristic Is Preferred in the Elements Contained in Moderator