Which one of the following elements is essential for the construction of nuclear reactors?
- ACobalt
- BNickel
- CZirconiumCorrect
- DTungsten
Explanation
The correct answer is Zirconium. It is essential for nuclear reactors primarily because it has a very low thermal neutron absorption cross section. This means it does not easily capture the neutrons needed to sustain the nuclear chain reaction. Additionally, Zirconium alloys possess high resistance to corrosion and can withstand the intense heat and radiation found inside a reactor core. For these reasons, it is the preferred material for cladding fuel rods, which hold the nuclear fuel pellets in place. While Cobalt, Nickel, and Tungsten have various industrial uses, they do not possess this specific combination of properties required for primary structural components in a nuclear reactor core.
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