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Activity

"Activity" is the number of decays per unit time of a radioactive sample, the term used to characterise the number of nuclei which disintegrate in a radioactive substance per unit time. Activity is usually measured in Becquerels (\(Bq\)), where 1 \(Bq\) is 1 disintegration per second, in honor of the scientist Henri Becquerel.

http://dbpedia.org/resource/Radioactive_decay

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

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

http://en.wikipedia.org/wiki/Radioactive_decay#Radioactive_decay_rates

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

\(A = Z + N\), where \(Z\) is the atomic number and \(N\) is the neutron number. Variation \(dN\) of spontaneous number of nuclei \(N\) in a particular energy state, in a sample of radionuclide, due to spontaneous nuclear transitions from this state during an infinitesimal time interval, divided by its duration \(dt\), thus \(A = -\frac{dN}{dt}\).

A