This study was carried out to obtain some information on the adequacy of the assumptions in an exothermic model, which was proposed for explaining the experimental observation of the sensitivity of the thermoluminescence dosimeter. It is expected from the model that the sensitivity is presented as both increasing and decreasing functions of irradiation temperature. This expected phenomenon was experimentally verified. Further, supralinearity and sublinearity of the thermoluminescence response to the dose could be qualitatively explained with the model. These results lead to the conclusion that the assumptions in the exothermic model are supported.