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- Dictionaryhalf-life/ˈhɑːflʌɪf/
noun
- 1. the time taken for the radioactivity of a specified isotope to fall to half its original value: "iodine-131 has a half-life of 8.1 days"
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noun
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Half-life is the time required for a quantity to reduce to half of its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable atoms survive. The term is also used more generally to characterize any type of exponential (or, rarely, non-exponential) decay. For example, the medical sciences refer to the biologica... Wikipedia