Question

$D_{2}O$ is preferred to $H_{2}O$ as a moderator, in nuclear reactors because

• A. $D_{2}O$ slows down fast neutrons better
• B. $D_{2}O$ has high specific heat
• C. $D_{2}O$ is cheaper
• D. None of these

Answer 1

Answer: (D)

None of these

$H_{2}O$ absorbs neutrons and this decreases the number of neutrons for the fission process. So, $D_{2}O$ is preferred to $H_{2}O$ as a moderator, in nuclear reactors.