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.

Graph of Radioactive Decay

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