Characteristic Limits. Decision threshold (1/2).

It is a characteristic limit that helps one to decide if the element is present or not in the analyzed sample.

When the measurement result is higher than the Decision Threshold, it is possible to affirm that the element is present in the analyzed sample. There exists, however, an established probability α (usually of 5 %) of finding background measurements above the Decision Threshold, where background comprise blank signal, interferences and continuum: