Which of the following is / are used as moderator (s) in nuclear reactors ?

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  1. Graphite
  2. Paraffin
  3. Heavy water
  4. All of these

Answer (Detailed Solution Below)

Option 4 : All of these
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The correct answer is All of these.

Key Points

Nuclear Reactor

  • A nuclear reactor is a system that contains and controls sustained nuclear chain reactions.

Neutron Moderators

  • A Neutron moderator is a medium that reduces the speed of fast neutrons i.e., nuclear chain reaction.
  • Moderators are like accelerators.

Commonly used moderators

  • Regular light water
  • Solid graphite
  • Heavy water
  • Graphite
  • Paraffin
Element Symbol Use
Cadmium Cd used in making battery
Uranium  U a radioactive element used as nuclear reactor fuel
Cobalt Co used in aircraft part manufacturing, battery
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