THERMOLUMINESCENCE INDUCED BY CS-137 GAMMA-RAYS IN ION-IMPLANTED AL2O3

Thermoluminescence curves from Na-ion-implanted Al2O3 irradiated by Cs -137 gamma rays, from Al2O3 irradiated only with Cs-137 gamma rays, an d from Al2O3 implanted only with Na+ Cs-137 but without irradiation we re measured over the temperature range of 340-620 K. The TL curve indu ced by Cs-137 gamma-ray irradiation of Al2O3 implanted with Na+ has tw o shoulders located at 407 K and 415 K and three TL peaks at 452 K, 50 8 K, and 568 K. The 452-K TL peak intensity of induced by Cs-137 gamma -ray irradiation Na-ion-implanted Al2O3 is higher than that from Al2O3 implanted only with Na+ and that from Al2O3 irradiated with only Cs-1 37 gamma rays. The Cs-137-gamma-ray-induced TL intensity of ion-implan ted Al2O3 is sensitive to the number of vacancies generated by ion imp lantation and to the projected ion range. The TL intensity dependence is found to have a very close relation with the ion dose, the energy, and the species.