Themoluminescence properties of nanocrystalline of BaSO4:Dy,Tb irradiated with gamma rays

Abstract

Nanocrystalline of BaSO4 and BaSO4:Dy,Tb of grain size 45-55 nm has been prepared by the co-precipitation method and its thermoluminescence characteristics have been studied. The formation of the material was confirmed by the X-ray diffraction (XRD) and UV-visible spectroscopy. Shape and size of the prepared nanocrystalline powder was observed by a scanning electron microscope (SEM). The TL glow curve of the nanocrystalline pellets of BaSO4:Dy,Tb shows a prominent single peak at 530 K along with another peak of lesser intensity at around 420 K and 560 K. On the contrary, the nanocrystalline pellets of BaSO4 show a peak of low intensity at 500 K and prominent peak around 460 K. The glow curve structure does not change at the range of 0.1-15 kGy and some new peaks appear at high doses but have low intensities. The 530 K of the nanocrystalline pellets of BaSO4:Dy,Tb shows a linear response with exposure increasing up to very high values (as high as 7 kGy), where the other doped BaSO4 show saturation. © 2013 Elsevier B.V.