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Glossary terms about Critical ionization energy

Critical ionization energy
The energy required to remove an electron from a stable shell or subshell.

3 pages mention Critical ionization energy

Characteristic X-rays
The K shell has the highest ionization energy or critical ionization energy in the atom. 
Quantitative EDS X-ray microanalysis using SEM
Fluorescence occurs when Characteristic X-rays produced by the primary-beam electrons from one element in the sample have an energy greater than the critical ionization energy of an electron shell in another element present in the sample. 
X-ray intensity
In order to generate Characteristic X-rays the electrons in the primary beam must have enough energy to overcome the ionization energy, also called the critical ionization energy, of the inner-shell electrons in the atoms of the sample.