Q.

Which of the following is used as a coolant in nuclear reactors?

A. Heavy water
B. Cadmium
C. Liquid sodium
D. Graphite
Answer» C. Liquid sodium
Explanation: Liquid metallic sodium may be used as the sole coolant, carrying heat from the core. Sodium has only one stable isotope, sodium-23. Sodium-23 is a very weak absorber of neutrons.
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