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Decay Constant

A constant characterizing the rate of radioactive decay, directly proportional to the probability of decay per nucleus.
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The statement of the theorem

Define the decay constant λ\lambda (units: T−1T^{-1}) as the proportionality factor relating the instantaneous decay rate R(t)R(t) to the number of nuclei N(t)N(t): \nR(t)=−dNdt=λN(t)R(t) = -\frac{dN}{dt} = \lambda N(t)
Source: Wikipedia