Definition of Half-life
Half-life
half-life
Definition/Meaning
(noun)
the amount of time needed for half of the atoms in a sample of radioactive substance to decay or disintegrate;
e.g. The element ha a very long half-life, so traces of it will linger for several years.
(noun)
the amount of time needed for half the amount of a substance such as a pesticide or drug in a natural system to be broken down or eliminated;
e.g. If a medicine has a short half-life, its effects will wear off relatively quickly.
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