Nuclear Power Engineering
An ideal coolant for a nuclear reactor should

Be free from radiation damage and non-corrosive
Be capable of attaining high temperature, only when it is pressurised
Be a good absorber of neutrons
Have high density, but low heat transfer co-efficient

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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

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

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