Glow curves were recorded for NaCl:Sr specimens subjected to annealing and quenching from elevated temperatures followed by deformation. These specimens were irradiated with ultraviolet radiation at room temperature by alluminium arc. Samples exhibit certain glow peaks which are observed only in the first thermal cycle. A marked difference in the glow curve pattern for the first and subsequent heating runs has been observed. It is suggested that vacancy clusters and dislocation dipoles produced during deformation influence the thermoluminescence process of the pretreated specimen.