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The control rods in the control system of nuclear reactors are used to

A control rod is a device that is used to absorb neutrons so that the nuclear chain reaction taking place within the reactor core can be slowed down or stopped completely by inserting the rods further, or accelerated by removing them slightly.

Cadmium is most commonly used as a control rod in nuclear reactors. Cadmium absorbs neutrons in the reactors, preventing them from creating additional fission events.