half-life
Definition: The time required for the potency of a chemical, drug or radioisotope to fall to half of its potency or to be eliminated from the body. For example, if the potency (or amount in the body) is 32 with a half-life of 10 days, the potency (or amount left in the body) will be 16 in 10 days and then will drop by half each of the following 10 days to 16, then 8, then 6, etc.
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