The half-life of a radioactive substance is the amount of time that it takes for one-half of an initial amount of the substance to disappear as the result of decay.

Name: The half-life of a radioactive substance is the amount of time that it takes for one-half of an initial amount of the substance to disappear as the result of decay.
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This is the definition of a half-life.

The Half-Life of a Radioactive Substance Is the Amount of Time