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Decay Constant

http://en.wikipedia.org/wiki/Exponential_decay

http://www.britannica.com/EBchecked/topic/154945/decay-constant

http://www.iso.org/iso/catalogue_detail?csnumber=31895

Relative variation \(\frac{dN}{N}\) of the number \(N\) of atoms or nuclei in a system, due to spontaneous emission from these atoms or nuclei during an infinitesimal time interval, divided by its duration \(dt\), thus \(\lambda = -\frac{1}{N}\frac{dN}{dt}\).

\(\lambda\)

The "Decay Constant" is the proportionality between the size of a population of radioactive atoms and the rate at which the population decreases because of radioactive decay.