Nuclear Power Engineering
Artificially produced radioactive isotopes are used for

Treatment of certain diseases
All of these
Initiating nuclear fission and fusion
Power generation

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

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

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