Multiple choice

Which of the following are used as moderators in Nuclear Reactors?

  1. Heavy water
  2. Graphite
  3. Beryllium

  1. 1 and 2

  2. 2 and 3

  3. 1 and 3

  4. All three
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Commonly used moderators include regular (light) water (roughly 75% of the world's reactors), solid graphite (20% of reactors) and heavy water (5% of reactors). Beryllium has also been used in some experimental types, and hydrocarbons have been suggested as another possibility.

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