Dresden 2017 – scientific programme
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BP: Fachverband Biologische Physik
BP 8: Posters - Bioimaging and Spectroscopy
BP 8.20: Poster
Monday, March 20, 2017, 17:30–19:30, P3
X-Band Electron Paramagnetic Resonance (EPR) Measurements of Absorbed Dose by Gamma Irradiated Fossil Tooth Enamel — •Ozgul Karatas1,2, Refik Kayali1, and Vladislav Kataev2 — 1Omer Halisdemir University, Faculty of Science and Letter, Physics Department, Nigde, Turkey — 2Leibniz Institute for Solid State and Materials Research IFW, Institute for Solid State Research, Dresden, Germany
The measurement of the concentration of stable free radicals in the calcified tissues, such as tooth, due to the radiation is directly related to absorbed dose and it has been used for dose assessment in retrospective dosimetry and dating studies. When tooth enamel is exposed to the ionizing radiation, radicals are formed, which can be detected using Electron Paramagnetic Resonance (EPR) technique. EPR using tooth enamel is based on the correlation between the intensity or amplitude of some of the radiation-induced with the dose absorbed in the enamel. In this study, teeth samples, which were extracted from archaeological site in Nigde, Turkey, were used in the experimental studies. Five animal teeth were selected to obtain an enamel sample formed and then this resultant sample was prepared with combined processes of mechanical and chemical treatment of teeth. This tooth enamel sample was irradiated by 60Co gamma-ray source in dose range of 0-9 kGy at Turkish Atomic Energy Agency (TAEK), ÇNAEM in Istanbul, Turkey and then EPR spectra were recorded by using Bruker EMX X-Band EPR spectrometer between 4K-300K temperatures, in Leibniz Institute for Solid State and Materials Research in Dresden, Germany. Radiation induced paramagnetic centers and radicals in this enamel were investigated and interpreted by obtained X-band EPR results.