Radioactive Half-Life

The radioactive half-life for a given radioisotope is the time for half the radioactive nuclei in any sample to undergo radioactive decay. After two half-lives, there will be one fourth the original sample, after three half-lives one eight the original sample, and so forth.

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Graph of Radioactive Decay

The radioactive half-life gives a pattern of reduction to half in any successive half-life period.
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