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Additional recommended knowledge
In a fixed mass of radioactive material, the number of becquerels changes with time. Sometimes, amounts of radioactive material are given after adjustment for some period of time. For example, one might quote a ten-day adjusted figure, that is, the amount of radioactivity that will still be present after ten days. This de-emphasizes short-lived isotopes.
SI uses the becquerel rather than the second for the unit of activity measure to avoid dangerous mistakes: a measurement in becquerels is proportional to activity, and thus a more dangerous source of radiation gives a higher reading. A measurement in seconds is inversely proportional. As any SI unit, Bq can be prefixed; commonly used multiples are kBq (kilobecquerel, 103 Bq), MBq (megabecquerel, 106 Bq), and GBq (gigabecquerel, 109 Bq).
When measuring radioactivity of a sample with a detector, a unit of "counts per second" (cps) is often used. Counts per second can be converted to the absolute activity of the sample in Bq if one applies a number of significant conversions, e.g., for the radiation background, for the detector efficiency, for the counting geometry, for self-absorption of the radiation in the sample.
The becquerel can be used for the frequency of aperiodic events; for periodic events, the hertz, which is also defined as s–1, is used as unit.
1 Bq = 1 s–1
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Becquerel". A list of authors is available in Wikipedia.|