Which of the following is used in a nuclear reactor to slow down fast-moving neutrons?
A
Carbondioxide gas
B
Liquid sodium metal
C
Concrete shield
D
Graphite rods
E
Boron rods
Verified Correct Answer: D.
Physical Principles & Numerical Solution
Graphite is commonly used as a moderator in nuclear reactors to slow down fast-moving neutrons, making them more likely to induce further fission reactions.
Source: Myschool Past Questions Archive (Record #25255)