[en] One of the purposes of personnel dosimetry monitoring is to provide data on the possible overexposures of the monitored individuals. Identifying the moment of overexposure can be a difficult task when the monitoring period is longer than one month and even when the period is one month this is not easy. The present paper proposes a new method that allows to place the moment of overexposure within one week in the total monitoring period, when using TLD-100 detectors (TLD-100 is a Harshaw Chemicals Co. registered trademark). The method relies on the different fading periods of the different regions of the TL spectrum of LiF:Mg,Ti (TLD-100). The measurements were performed using a Harshaw 6600 TLD reader, with a Harshaw 4800 dry air generator to supply the heating gas. All the cards were irradiated with the same dose, then read out at different moments after the irradiation. The spectrum was divided into four regions of interest (ROI): the low temperature region (ROI1), including peaks 1 and 2, the medium temperature region (ROI2), including peak 3, the dosimetric region (ROI3), including peaks 4 and 5 and the high temperature region (ROI4), usually including the infrared signal. For every readout we have determined the ratios ROI1:ROI3, ROI2:ROI3. The ratio ROI4:ROI3 was used as an indication for the noise-to-signal ratio, and it proved to be constant, within the expected statistical variations. The plot of the ratios mentioned above have shown that they can be used to determine the moment of a single irradiation within a period of two months with an error of ±3 days. This means that the method can be used to locate the moment of irradiation within a week from a monitoring period of two months. The paper also presents the advantages and disadvantages of this method compared to the analysis by computerised glow curve deconvolution. (author)