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X-ray intensity

Essentially all X-ray measurements are made by photon counting techniques but the results are seldom converted to radiant flux or irradiance 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, I, is commonly used and expressed as photons/unit time detected. Likewise the term relative X-ray intensity, I r, 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.
Source:
PAC, 1980, 52, 2541 (Nomenclature, symbols, units and their usage in spectrochemical analysis - IV X-ray emission spectroscopy) on page 2544
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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. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi:10.1351/goldbook.X06714.
Original PDF version: http://www.iupac.org/goldbook/X06714.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
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