______________ is not used as the control rod material in a nuclear reactor ?

Correct answer: A. Cobalt

  • A. Cobalt
  • B. Hafnium
  • C. Cadmium
  • D. Boron

Explanation

Control rods require strong neutron absorbers such as boron, cadmium or hafnium. Cobalt is not normally used as a control-rod material, although it can become radioactive under neutron irradiation.

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