Termolüminesans dozimetrik materyallerin üretilmesi (CaSO4)

ABSTRACT PRODUCTION OF THERMOLUMINESCENCE DOSIMETER MATERIALS C CaS04] KOKSAL Ayda M.S. İn Engineering of Physics Supervisor: Assoc. Prof.Dr. Ata SELÇUK February, 1991 104 pages The accurate measurement of exposure and dose is important in the monitoring of persons who are accupationally exposed to ionizing radia tions. Such measurements have traditionally been carried out using devices such as air ionisation chambers and film badges, and also thermoluminescence (TL) dosimeters are increasingly being used. The purpose of this thesis is to provide an information about the use of TL teflon dosimeters in ionising radiation dose measurements after preparations of the dosimeters. In this study, luminescence phenomena, theoretical aspection to TL, prepration of phosphors, measurements, calculations and also conclusions have been discussed. In this work, the crystal growth of CaSO» is performed dopping some impurities in different percentage. These impurities are Mn, Mg, Zn, Se and Mn,Mg (double activated). Different properties of the phosphor depending on these dopped materials are investigated and some characteristics like glow curve, dose-response curve and sensitivity stability are also investigated. Some kinetics constans of teflon dosi meters are calculated. These constants are trap energy and frequency factor. Keywords: CaSO., thermoluminescence (TL), dosimeter, iii