Studying CaSO4:Eu as an OSL phosphor


Güçkan V., Altunal V. , Nur N., Depci T., ÖZDEMİR A., Kurt K., ...More

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, vol.407, pp.145-154, 2017 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 407
  • Publication Date: 2017
  • Doi Number: 10.1016/j.nimb.2017.06.010
  • Title of Journal : NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
  • Page Numbers: pp.145-154
  • Keywords: Calcium sulfate, Optically stimulated luminescence, Dosimetry, Precipitation synthesis method, Beta radiation, Thermal stability, OPTICALLY STIMULATED LUMINESCENCE, DOPED LITHIUM TETRABORATE, THERMOLUMINESCENCE, DEPENDENCE, DOSIMETRY, MECHANISM, GRAPHITE, NEUTRON, PELLETS, GAMMA

Abstract

This study was carried out to investigate the properties of the OSL signal from Eu-doped calcium sulfate (CaSO4:Eu) phosphor and study on its thermal behavior as a function of temperature under a series of luminescence experiments. The suitability of its usage as an optically stimulated luminescence (OSL) dosimeter was also checked. CaSO4:Eu was synthesized using the precipitation method and prepared in pellet form. The dopant concentration value was performed as 0.1 mol%. The synthesized CaSO4:Eu was analyzed by X-ray diffraction (XRD) method to confirm the product. To have an idea about the crystallography and microstructure morphology of the material, scanning electron microscope (SEM) analysis were carried out. It was found that the OSL signal is a resultant signal having three components and exhibits thermal quenching above 150 degrees C. The excitation spectrum of CaSO4:Eu showed, different peaks in the region 220-360 nm with the highest one at 269 nm. Thermoluminescence (TL) signals of CaSO4:Eu pellets were obtained and compared with the TL signals obtained after OSL measurements of the same pellets by blue light stimulation. The low temperature, peak near 180 degrees C did not show any significant change in TL after OSL measurement whereas the high temperature peak at 240 degrees C was bleached with the blue light illumination and might be responsible for the observed OSL signal.