Terms sourced from: http://iupac.org/publications/pac/63/5/0735/

"Nomenclature, symbols, units and their usage in spectrochemical analysis - VIII. Nomenclature system for X-ray spectroscopy (Recommendations 1991)", Jenkins, R.;Manne, R.;Robin, R.;Senemaud, C., Pure And Applied Chemistry 1991, 63(5), 735