Verification of radiation dose received by the exposed area during a medical treatment, is essential for the evaluation of any radiotherapy regime. The LiF:Mg,Ti is one of the most widely used commercial dosimeters for this purpose. In this work, crystals of LiF:Mg,Ti (TLD -100), stored under environmental conditions, were irradiated with different dose using a unit of 60 Co Theratron 780C, in ambient temperature air. The reading was carried out in a Harshaw TLD 4500. A slight increase in the uncertainty of the response of the crystal, was observed in the results; this increase could be associated to the high ambient temperature. While, with the dose until the 4 Gy, a linear behavior in the response is maintained and followed by a supralinear region. The decline presented in the TL response of the crystals, was very above the 10 % monthly reported in the literature; this discrepancy in the values is related with the high ambient temperature, and the high relative humidity during the storage.