Nuclear Power Engineering
Thermal shield is used in high powered nuclear reactors to

Protect the fuel element from coming in contact with the coolant
Absorb the fast neutrons
Slow down the secondary neutrons
Protect the walls of the reactor from radiation damage

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Nuclear Power Engineering
Molten sodium (as a coolant in fast breeder reactor)

None of these
Is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water
Can't attain high temperature at normal pressure
Is not at all corrosive, even at a higher temperature

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