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
The fuel required (e.g. deuterium and tritium) is scarce
It is difficult to initiate fusion reaction
It is difficult to control fusion reaction

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Nuclear Power Engineering
In a pressurised water reactor (PWR), the

Coolant water boils in the core of the reactor
Use of moderator is not required
Fuel is natural uranium and heavy water acts both as moderator & coolant
Coolant water is pressurised to prevent bulk boiling of water in the core

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

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