Nuclear Power Engineering
The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then

It will completely disintegrate in four months
3/4th of it will disintegrate in two months
It will completely disintegrate in two months
L/8th of it will remain intact at the end of four months

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Nuclear Power Engineering
Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher

Melting point, hence can be subjected to higher temperature
Density ; hence core volume for a given power output would be smaller
Resistance to effects of irradiation
All of these

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

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

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