1.1 BASIC PRINCIPLES OF X-RAY FLUORESCENCE
The principle of the X-ray fluorescence (XRF) technique is based on the use of some excitation radiation to produce ionization in the inner shells of the atoms present in the sample due to photoelectric absorption. The process of atom ionization and X-ray characteristic emission is illustrated in Figure 1.1.
Figure 1.1. Processes of atom ionization and X-ray characteristic emission.
If a photon with energy larger than the binding energy of an inner electron orbital, impinges onto the atom, part of its energy can be absorbed with a certain probability (photoelectric absorption) ...