Nuclear Power Engineering
Artificially produced radioactive isotopes are used for

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

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Nuclear Power Engineering
Commercial power generation from fusion reactor is not yet possible, because

It is difficult to initiate fusion reaction
The fuel required (e.g. deuterium and tritium) is scarce
It is difficult to control fusion reaction
Quantity of fuel required for initiating fusion reaction is prohibitively high

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