THERMOLUMINESCENT CHARACTERISTICS OF KBR-EU AND KBR-EU,MG IRRADIATED WITH UV-LIGHT

The TL response of KBr:Eu (0.1% Eu) and KBr:Eu,Mg (0.1% Eu, 0.01 and 0 .001% Mg) to 254 nm UV light has been studied. Crystals were subjected to different thermal treatments. The Mg concentration and the thermal treatment that produced the best glow curve reproducibility and sensi tivity increase were identified. The sensitivity to UV radiation incre ased by about three times after the optimum thermal treatment. The add ition of Mg (0.001%) was responsible for improvements in the reproduci bility of the glow curve characteristics for different samples. The gl ow curves showed two high-temperature peaks above 170 degrees C, simil ar to those observed after exposure to gamma rays, and the TL response was linear for fluences between 15 and 150 J m(-2).