Gamma ray induced sensitization of 110 degrees C TL peak in quartz separated from sand

We have investigated the gamma ray induced sensitization of the 110 degrees C TL peak in quartz, separated from sand, in the dose range 30-750 Gy. A p re-dose of 100 Gy followed by annealing at 500 degrees C for 1 h yielded an optimum sensitization factor of 14.2 for a test gamma dose of 0.5 Gy; this factor decreases slowly up to the studied pre-gamma dose of 750 Gy. From E SR studies carried out in the temperature range 25-550 degrees C, the forma tion of E'(1)-centres and their subsequent decay (at temperatures >400 degr ees C) have been observed. The released charge carriers (electrons) may lea d to elimination of competitors (as a result of their filling up). Thus, th e radiation-induced sensitization of the 110 degrees C TL peak could be due to elimination of the competing deep traps. (C) 2000 Elsevier Science Ltd. All rights reserved.