Nuclear Power Engineering
Artificially produced radioactive isotopes are used for

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

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Nuclear Power Engineering
Water is a better coolant than a gas (like CO₂, He, N₂ etc.), because it

Has a better heat transfer characteristics, and it can be pressurised to attain a high temperature
All of these
Requires comparatively smaller pumps and heat exchanger for a given heat transfer rate
Is a better neutron moderator as well

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