Webster's Online Dictionary
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Specialty Expressions: HALF-LIFE PERIOD

ExpressionsDomainDefinition
Half-life periodPhysics1: For a single radioactive decay process, the mean time required for the activity to decrease to half its value by that process. Source: European Union. (references)
  2: The time taken for the concentration of the parent compound to be reduced to half its original value. It thus gives a measure of the persistence of the chemical in that particular soil. Source: European Union. (references)

Source: compiled by the editor from various references; see credits.

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