# decay constant

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## de·cay con·stant

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 (d

*N*/*N*) of the number of atoms (*N*) of a radionuclide disintegrating in time d*t*, d*N/N*= -λd*t*.## de·cay con·stant

(dĕ-kā' kon'stănt)The fractional change in the number of atoms of a radionuclide that occurs in a unit of time; the constant l in the equation for the fraction (DN/N) of the number of atoms (N) of a radionuclide disintegrating in time

Synonym(s): radioactive constant.

*Dt, DN/N = - lDt*.Synonym(s): radioactive constant.

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