Multiple choice

D2O and graphite are generally used as:

  1. fuel

  2. control rods

  3. shielding

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

Only neutrons of a fairly low speed should be used to have controlled chain reaction. To slow down the speed fast moving neutrons produced during the fission process, moderators are used. Moderator reduces the speed of the neutron by absorbing its energy but not absorb neutron. Graphite, heavy water and beryllium are common moderators.

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