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half-life

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half-life

mean duration after which a decaying quantity has reached half of its initial value

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About half-life

Half-life is the time required for a quantity to reduce to half of its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable atoms survive. The term is also used more generally to characterize any type of exponential decay. For example, the medical sciences refer to the biological half-life of drugs and other chemicals in the human body. The converse of half-life is doubling time, an exponential property which increases by a factor of 2 rather than reducing by that factor.

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Facts from Wikidata (CC0). Image by Sbyrnes321 via Wikimedia Commons (Public domain).

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Not who you're looking for? Others named half-life: 1998 first-person shooter video game · 2004 novel by Aaron Krach · 2008 film by Jennifer Phang

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