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The becquerel (symbol Bq) is the SI derived unit of radioactivity, defined as the activity of a quantity of radioactive material in which one nucleus decays per second. A petabecquerel is 1015 times a becquerel, [math]\frac{-dN}{dt}=\lambda N[/math] s-1, s for second, dimensionally is it second minus one, i.e. inverse seconds.

The unit is named in honor of Henri Becquerel.

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