4. Activity measurement with standard
The activity of the source to be measuredA , expressed in becquerels (Bq), is equal to the count rate delivered by the measuring device N divided by the detection efficiency R :
As detection efficiencies are generally less than unity, and vary according to measurement conditions, liquid scintillation is the most frequently used measurement method, and is relative to a standard source of the same radionuclide.
4.1 Source preparation
The validity of activity measurements carried out by liquid scintillation counting depends on the correct preparation...
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Activity measurement with standard
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