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

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Nuclear Power Engineering
Secondary cooling circuit is a must in molten sodium cooled fast breeder reactor for

Lowering the coolant circulation pressure
Achieving high degree of superheat in the steam
Avoiding the mixing of water with radioactive sodium, as it may cause explosion
Faster heat removal rate from the core

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