Effect of γ-radiation on NaZnSO4Cl:Ce, Dy or Mn ions and retrapping of charges in TL

The thermoluminescence (TL) characteristics and effect of γ-radiation on newly invented NaZnSO4Cl:Ce, Dy or Mn ions and retrapping of charges in TL material prepared by wet chemical method are studied. The sensitivity of the NaZnSO4Cl:Ce, Dy or Mn phosphors is higher than that of CaSO4:Dy with the broadness of the glow peak for various concentrations of Ce, Dy, Mn and different γ-rays doses. The phosphor NaZnSO4Cl:Ce has remarkable high sensitivity as compared to NaZnSO4Cl:Dy or Mn. The phosphors NaZnSO4Cl:Ce, and Mn have a simple TL glow curve structure with a single prominent peak at around the temperature 170 and 190 °C, whereas NaZnSO4Cl:Dy has two peaks located at 175 and 298 °C indicating single and double trapping sites respectively. TL response, fading and reusability characteristics and the trapping parameters of the phosphor are also studied and it is found that the phosphor is quite suitable for use in dosimetry of ionizing radiations.