Thermoluminescence glow peak parameters for LiF:Mg,Ti with modified activator concentration

We studied the difference between the response of standard 7LiF:Mg,Ti (MTS) thermoluminescence detectors and the response of a new version of 7LiF:Mg,Ti (MTT) with modified activator composition and increased high-LET response. In this study we used the Co-60 radiotherapy beam at IFJ in Kraków and charged particle beams of the HIMAC accelerator in Chiba. The MTS and MTT detectors were exposed and annealed in the same conditions and the analysis was performed via the experimental Tm-TstopTm-Tstop method and deconvolution with a first-order kinetic function, using the GlowFit software, recently developed at IFJ. We found that although the number of peaks in both materials is the same, the shape of MTT glow curve is quite different, compared to the standard MTS. The difference lies in the proportions between particular peaks and also in their kinetic peak parameters. Temperatures of the peak maxima in MTT are shifted towards lower values. The activation energies also change, making the peaks wider and the TL glow curve more complex. This feature is visible especially in the main peak region where peaks 4 and 5 overlap. Another difference in MTT is in the high-temperature peak region, which is more pronounced and differently shaped. The signal originating from peak 3 is stronger in MTT and gives the strongest contribution to the total signal.