wo elements which are used to absorb neutrons to control the chain reaction during nuclear fission are -

A. Boron and Cadmium
B. Boron and Plutonium
C. Cadmium and Uranium
D. Uranium and Boron
Answer» A. Boron and Cadmium
Explanation: Since the continued chain reaction of a nuclear fission reactor depends upon at least one neutron from each fission being absorbed by another fissionable nucleus, the reaction can be controlled by using control rods of material which absorbs neutrons. Cadmium and boron are strong neutron absorbers and are the most common materials used in control rods. In the operation of a nuclear reactor, fuel assemblies are put into place and then the control rods are slowly lifted until a chain reaction can just be sustained.
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