Nuclear Power Engineering
Thorium⁻²32 (a fertile material) on absorption of a neutron gets converted into __________ , which is a fissile material.

Plutonium⁻²39
Uranium⁻²35
Thorium⁻²33
Uranium⁻²33

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

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