Effects of Illumination on the Thermoluminescence of Alkali Halides

Illumination with monochromatic light into the $F$- or $V$-absorption bands of KBr, KI, NaCl, and KCl single crystals at liquid nitrogen temperature (LNT), after x irradiation at room temperature (RT), "reexcites" different glow curves in the region between LNT and RT. $F$ illumination produces a set of electron thermoluminescence peaks, and $V$ light a set of hole peaks. Both sets of peaks add up to the regular glow curve obtained after x irradiation at LNT. The results are consistent with existing models of the thermoluminescence process.