Glossary · term

Half-life

Nuclear & Particle

Aliases
half-lives
Domain
Nuclear & Particle

Definition

The time for half of a sample of a radioactive isotope to decay. Fixed for each isotope, from microseconds to longer than the age of the universe.

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From the Glossary database in Notion, last edited 2026-08-17. This page is the row, rendered by the build; nothing on it is written by hand.