[en] In the thermoluminescent method, we are measuring the light emitted by the phosphor (called TL output), irradiated previously by ionizing radiation. There are several other effects, which can cause emission of light similar to the TL output, which can affect the results of personnel and environmental dosimetry, especially for low doses. It is described several such effects, as illumination of lithium fluoride thermoluminescent dosimeters, particularly with ultraviolet wavelengths. It was presented that the results of the glow curve of LiF:Mg,Ti chips, after exposure to different non-ionizing radiation (u.v., microwave, electric sparks). It has reviewed the reports of light induced signals in LiF ( I > 380 nm). These effects cause dosimeters to emit TL similar to that caused by exposure to ionizing These effects cause dosimeters to emit TL similar to that caused by exposure to ionizing radiation.A signal is received when heating teflon sheets, which contributes to the TL signal. It was pointed out that the light induced TL emission from the teflon has a glow peak 120 degree C. The purpose of the present work was to perform a quantitative evaluation of the glow contributed by the teflon used in the TLD cards employed by us Harshaw - TLD 100 for different storage conditions. (authors)