Nuclear Power Engineering
Heavy water is preferred over ordinary water as a coolant, because it.

Can be heated to a higher temperature without pressurizing
Acts both as an efficient coolant as well as a moderator
All of these
Is less prone to radiation damage

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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

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

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