Q 12-13-024NEETJEE MainEasy
In a nuclear reactor, the function of the moderator is to
Answer: (C) slow down fast neutrons
Concept. Slow (thermal) neutrons are much more likely to cause fission of U-235 than fast ones.
Step 1. Role of the moderator. Heavy water or graphite slows fast neutrons down by collisions. (Control rods of cadmium or boron absorb excess neutrons; the coolant removes heat.)
Answer. Slow down fast neutrons (Option C).
Solution by Sreeraj P, M.Sc Physics