Nuclear Power Engineering
A fertile material is the one, which can be

Fissioned by fast neutrons
Fissioned by slow (thermal) neutrons
Fissioned by either slow or fast neutrons
Converted into fissile material on absorption of neutron

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

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