Abstract The phototransferred thermoluminescence (PTTL) technique is used to reassess doses in various materials. In this work, PTTL properties of LiF (Mg, Cu, P) have been studied. The optimum PTTL signal occurred at an ultraviolet (UV) exposure of ∼ 1770 J m -2 and corresponded to (1.0 ± 0.3)% of the primary TL signal for gamma doses in the range 0.05–4.0 Gy. Whether the ultraviolet irradiation was performed at room temperature, 0°C, or liquid-nitrogen temperature did not make any difference to the PTTL signal. A sensitization technique involving a ‘pre-dose’ followed by annealing was then used in an attempt to increase PTTL sensitivity. The PTTL sensitivity showed a big increase as the sensitization dose increased beyond 100 Gy.