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Definition: the fractional change in the number of atoms of a radionuclide that occurs in unit time; the constant λ in the equation for the fraction (dN/N) of the number of atoms (N) of a radionuclide disintegrating in time dt, dN/N = −λdt.
Synonym(s): disintegration constant, radioactive constant, transformation constant
Examples: glitazone, GI cocktail, etc.
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