to
.
Each electron produced by the initial photo-ionization causes one avalanche. Since the number of avalanche events is proportional to the
energy of the incident photons, the charge collected by the anode is proportional to the X-ray photon energy.
Source:
PAC, 1995, 67, 1745
(Nomenclature, symbols, units and their usage in spectrochemical analysis-XI. Detection
of radiation (IUPAC Recommendations 1995))
on page 1754