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Control rods are made of __________

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Control rods are made of __________

(a) Cesium

(b) Cadmium

(c) Tin

(d) Gallium

This question was posed to me during an interview.

The question is from Nuclear Reactor Components in portion Nuclear Power Plant of Energy Engineering

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The correct answer is (b) Cadmium

To explain: Control rods are made of cadmium or boron or Hafnium. They have huge neutron absorption cross sections. The control rods are lowered or raised in the reactor core.  Control rods are used in control rod assemblies and inserted into the guide fuels within a fuel element.

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