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Glossary terms about Mass Absorption Coefficients

Mass Absorption Coefficients (MAC)
A matrix of numbers reflecting the absorption of a particular X-ray line (the emitter) by all the other elements in the periodic table.

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Quantitative EDS X-ray microanalysis using SEM
Mass absorption coefficients are stored as a matrix of numbers of absorption of a particular X-ray line (the emitter) by an absorber: For example, a portion of the MAC matrix for Kα X-rays for Z = 23 to 29 is shown below.