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decay constant |
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The rate of elimination fit best to a two-phase exponential decay with a biologic half-life of 12 and 266 hr. When a quantity decreases by a fixed fraction--here 1/2--it's known as exponential decay. If, for example, one combines the last known term with half the previous term, adding or subtracting according to the toss of a coin, the sequence's numbers decrease at a certain rate, displaying exponential decay. |
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The constant ratio for the number of atoms of a radionuclide that decay in a given period of time compared with the total number of atoms of the same kind present at the beginning of that period. Also called disintegration constant, radioactive constant.