STUDY ON THERMOLUMINESCENCE PROPERTIES OF K2GdF5:Tb3+

In this article, K2GdF5 substance was doped by various Tb3+ ion with concentrations 2, 5, 10, 15, 20 mol%, and the materials were synthesized by the solid state reaction method. The K2GdF5 material had orthorhombic structure of Pnam symmetry with the wrinkled surface structure shown on SEM images. The fluorescence spectrum indicated that the luminescence property of this material was due to the Tb3+ ions. In the thermoluminescence (TL) investigation, the glow curves of K2GdF5:Tb3+ owned three peaks at 196, 236 and 305 °C when measuring at 2 °C/s heating rate, the main peak (at 196 oC) could be used to determine the dose by the TL method. The sensitivity, linearity and responsivity to different radiation doses of materials were also examined. In addition, some of the thermoluminescence responses of materials with neutron doses were also investigated. The results showed this materials own thermoluminescence properties, which could be applied in measuring nuclear radiation including neutron doses