Sensitivity, Limit of detection, and Precision

An important statistical consideration in XRF analysis is the capability of an instrument to detect whether an element is present or not in a specimen. The capability can be described by the detection limit. It is defined as being the 

The experimental analytical precision (EAP) is represented by the standard deviation, in terms of concentration unit, of 10 times measurements of the net intensity of the analyte in the same analytical context for a 95.4% confidence level.  

Prepare 10 specimens from a single sample using the same preparation method. 

Measure all elements of interest in each of the 10 specimens once using the same analytical program. 

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