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

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Nuclear Power Engineering
A boiling water reactor is the one, in which the

Coolant water is allowed to boil in the core of the reactor
Pressurised water is pumped into the core
Fuel and the coolant are thoroughly mixed to form a homogeneous solution
Coolant water, after being heated in the reactor core, generates steam in a boiler

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