What is the function of the moderator in a fission reactor?
A)The moderator absorbs gamma rays.
B)The moderator absorbs slow neutrons.
C)The moderator decreases the speeds of fast neutrons.
D)The moderator prevents heat loss from the reactor core.
E)The moderator prevents the reactor from reaching a critical state.

Question

Quizplus · Accepted Answer

The function of the moderator is to decrease the speeds of fast neutrons so that they can cause further fission reactions. This is because fast neutrons are less likely to cause fission reactions compared to slow neutrons. The moderator achieves this by scattering the fast neutrons, thereby slowing them down. Choice A is incorrect because gamma rays are not slowed down by moderators, and they are not involved in the fission process. Choice B is incorrect because slow neutrons are already present in the reactor, and the moderator is not needed to absorb them. Choice D is incorrect because the moderator does not affect heat loss from the reactor core. Choice E is incorrect because a critical state is necessary for sustained nuclear reactions, and the role of the moderator is to facilitate this.

What Is the Function of the Moderator in a Fission