Abstract
In this paper, we present a study of the phototransference thermoluminescence (PTTL) of charges from deep traps in natural phosphate, using 254nm UV radiation. The natural material glow curve has one peak at 260 degrees C, while the phototransfered glow curves has an additional peak at 150 degrees C. The optimal conditions were illumination time of 180 min, and a preheating temperature of 500 degrees C. The PTTL signal was found to be linear over the gamma (gamma) dose range 0.1Gy-1000Gy. The efficiency of low dose reassessment reaches about 100 percent of the first readout. After two weeks of storage the PTTL signal was found to be 98 % of the original value. The results show the convenience of this method for the purpose of dose re-estimation over the dose range 0.1- 5Gy. Such method is useful in radiation retrospective dosimetry and dating.