Multichannel spectrometers above

The graphical method described above using the x-ray tube current can also be employed with the multichannel analyzer systems in energy-dispersive spectrometers. The filter technique cannot be used, however, since it distorts the measured spectrum. The general equation (4.124) must be used. Fortunately, the value of the ratio R/p(E) can be measured directly from the observed spectrum on the multichannel analyzer at low counting rates. This allows the true deadtime to be calculated from Eq. (4.125). 

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