[en] A member of the β-quartz series (Li_0.73Al_0.73Si_1.27O₄) was synthesised using the ceramic method from precursor powders - Li₂CO₃,Al(NO₃)₃.9H₂O, Si(C₂H₅O)₄ - with identical composition. Crystallisation of the gel was obtained by heating the raw material at 800 deg. C for 12 h. The XRD pattern of the synthetic sample indicates a β-quartz structure with hexagonal symmetry. Thermoluminescence (TL) signals of annealed samples at 1200 deg. C for 12 h, and non-annealed samples, were measured in the UV blue region of the spectrum. The non-annealed irradiated β-quartz displays two TL peaks at 110 deg. C and 280 deg. C which, after different additional radiation doses (from 0.4 to 5 Gy), display high linearity. The other annealed irradiated aliquots show a similar behaviour and stronger linearity. Thermal treatments at high temperature (1200 deg. C) produce ionic self-diffusion and loss of lithium atoms through the open hexagonal channel of the β-quartz structure. These [AlO₄/Li⁺]⁰ defects are responsible for the high radiation sensitivity of the sample. (author)