| 释义 |
decay constant
decay constant[di′kā ‚kän·stənt] (physics) The constant c in the equation I = I0 e -ct , for the time dependence of rate of decay of a radioactive species; here, I is the number of disintegrations per unit time. Also known as decay coefficient; disintegration constant; radioactive decay constant; transformation constant. decay constant
de·cay con·stantthe 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 constantde·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 Dt, DN/N = - lDt.
Synonym(s): radioactive constant. |