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Definitions:

Nausea

A sensation of unease and discomfort in the stomach with an urge to vomit.

Radioactive Decay

The process by which an unstable atomic nucleus loses energy by emitting radiation.

Half-life

The time required for half of the atoms in a radioactive substance to undergo decay, a characteristic constant for each radioactive isotope.

Half-life

The time required for half the atoms of a radioactive substance to decay into a stable form.

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