Essentially all X-ray measurements are made by photon counting
techniques but the results are seldom converted to radiant flux
or radiant exposure
. The term photon flux
would be appropriate if the measurements were corrected for detector efficiency but
this is seldom done for X-ray chemical analysis. Therefore the term X-ray intensity,
is commonly used and expressed as photons/unit time detected. Likewise the term relative
is used to mean the intensity for the analyte in an unknown specimen divided by the
intensity for a known concentration of the analyte element.
PAC, 1980, 52, 2541
(Nomenclature, symbols, units and their usage in spectrochemical analysis - IV X-ray
on page 2544
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook