Becquerel

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, ${\frac {-dN}{dt}}=\lambda N$ 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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Curie (unit)

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SI units
Authority: International System of Units (BIPM)
Base units	ampere candela kelvin kilogram metre mole second
Units based on other units	becquerel coulomb degree Celsius farad gray henry hertz joule katal lumen lux newton ohm pascal radian siemens sievert steradian tesla volt watt weber
Other SI units	astronomical unit bar dalton day decibel degree of arc electronvolt hectare hour litre minute minute of arc neper second of arc tonne atomic units natural units
See also	Conversion of units Metric prefixes Systems of measurement
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