Paper Details

KBr: Sm3+Tb3+ crystals were successfully grown by Bridgemann Stockbarger technique. Thermoluminescence(TL) properties of these crystals were investigated. Before taking the TL ,the sample annealed at 400° C and thenirradiated at a γ –ray dose of 5 Gy. The TL glow curve was recorded after the samples were irradiated with γ-rays for1-hour with the heating rate of 5°C/sec. The TL glow peak deconvoluted using the Origin 5.0 software. The deconvolutedglow peak reveals two clearly visible distinct peaks at temperature around 448K and 501K. The various parameters suchas geometric factor, Activation energy and Frequency factor were found out using Chen’s peak shape method. Thecalculated kinetic parameters show that both peaks follow the second order kinetics. The high temperature peak at 501Kis due to high energy traps and it is very useful for TL dosimeter (TLD) phosphor characteristics. The deconvoluted TLemission spectrum for the glow peak at 501K shows two well separated peaks centered at 583nm and 644nm whichconfirms emission is only due to samarium ions. Scanning electron micrographs (SEM) of KBr: Sm3+ Tb3+ crystals, it isfound the particles are cubic in shape with various sizes ranging from few microns to 10 microns and also cluster isfound. The micron size of crystallite from SEM image is best suited for dosimetric applications.

K.Saradha, S.Bangaru, “THERMOLUMINESCENCE BEHAVIOUR IN THE KBr : Sm3+ Tb3+ SINGLE CRYSTALS”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 4, Issue 17, pp. -, January 2017.