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en-wikipedia-org-359		Half-life - Wikipedia			.html	text/html	2675	414	70	This article is missing information about the history of the term half-life. For example, the medical sciences refer to the biological half-life of drugs and other chemicals in the human body. 2 Formulas for half-life in exponential decay A half-life usually describes the decay of discrete entities, such as radioactive atoms. In other words, the probability of a radioactive atom decaying within its half-life is 50%.[2] Formulas for half-life in exponential decay[edit] t1⁄2 is the half-life of the decaying quantity, Half-life and reaction orders[edit] The t1/2 formula for a zero order reaction suggests the half-life depends on the amount of initial concentration and rate constant. There is a half-life describing any exponential-decay process. As noted above, in radioactive decay the half-life is the length of time after which there is a 50% chance that an atom will have undergone nuclear decay. List of radioactive nuclides by half-life	./cache/en-wikipedia-org-359.html	./txt/en-wikipedia-org-359.txt