THERMOLUMINESCENCE RESPONSE OF NEW KClxBr1-x:EuCl3 SINTERED PHOSPHORS EXPOSED TO BETA AND GAMMA RADIATION.

Alkali halides crystals have been the subject of intense research for an understanding of their radiation-induced defects and luminescence properties. They exhibit noteworthy thermoluminescence (TL) properties when exposed to ionising radiation. Currently, these materials are grown employing expensive and rather complicated techniques. In this work, the results on the TL properties of new alkali halides phosphors fabricated by a simple and inexpensive procedure are presented. The samples were made by mixing KCI, KBr and EuCl₃ salts, and compressing them at a pressure of 3.2 × 10⁷ Pa during 3 min, followed by sintering at 700°C during 24 h under air atmosphere. The dosimetric response of the samples showed an increase with radiation dose in the 1.5-20.0 Gy dose range for beta and gamma radiation. The TL glow curves in sintered samples presented significant differences in their peak structures compared with monocrystalline samples, indicating that the nature of the trapping states and the recombination mechanisms may be different. [ABSTRACT FROM AUTHOR]