Which of the following is a moderating material used in nuclear reactor ?
Correct answer: D. Graphite
- A. Stainless steel
- B. Cadmium
- C. Zircaloy (an alloy of zirconium and aluminium)
- D. Graphite
Explanation
Graphite slows fast neutrons to thermal energies, increasing the probability of fission in fuels such as uranium-235. Cadmium is mainly a neutron absorber, while zirconium alloys and stainless steel serve structural purposes.
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