Quantification using tags allows a survey spectrum to be used to obtain an elemental quantification of a sample based on regions while narrow scan spectra identified with these regions defined on the survey data provide chemical state information for the quantification table.
There are two reasons why quantification using tags is preferable to direct quantification of data:
1. Provided the survey acquisition mode is well characterised in terms of intensity calibration, reliable quantification of a sample can be obtained without the need to similarly intensity calibrate the higher resolutions modes used to acquire narrow scan spectra aimed at extracting chemical state information about the sample.
2. Error estimates in terms of atomic concentration can be calculated for both the survey spectrum regions and also the chemical state information gathered from the narrow scan spectra.