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The present work reports the thermally stimulated luminescence displayed by
sodium with different percentages of indium as impurity the doped NaCl: In crystal after
exposure to UV light is studied. The thermal glow curves exhibited by NaCl: In shows
interesting results. The dependence of dopant concentration on TL in NaCl: In crystal is
investigated. The interaction of ionizing radiations with matter leads to various effects,
some of which leave memory in the target material. This memory effect can be seen as
the after effects of the irradiation. This paper describes the sequence of the physical
events beginning with the incidence of an ionizing particle. Leading to trail of atomic and
electronic displacements which stabiles in the form of so called defect centers. The
kinetics of the thermoluminescence process has been explained phenomenological. The
TL phenomenon has found many particle applications. The most outstanding of these are
in dosimetry and in archaeology. The paper deals mainly with the physical processes
involved in the TL emission and allude briefly to its involvement in applied areas.
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