title: Detection of free radicals in gamma-irradiated seasnail hard tissues by electron paramagnetic resonance.
abstract: Gamma-irradiated seasnail (from family of Helix lukortium) hard tissues (CaCO3) were investigated by electron paramagnetic resonance (EPR) at room temperature. The radicals produced by gamma-irradiation in seasnail were attributed to orthorhombic C*O2-, freely rotating C*O2-, orthorhombic C*O3-, axial C*O3-, and axial C*O3(3-) free radicals. Unirradiated seasnail hard tissues also feature Mn2+ ions in their EPR spectra. The hyperfine values were determined for the 13C nucleus in the orthorhombic C*O2- and axial C*O3(3-) free radicals and for the manganese impurity ions. The g values of all the free radicals have been measured. The results were compared with the literature data for similar defects.
authors.affiliation: Faculty of Arts and Sciences, Physics Department, Nigde University, Nigde, Turkey. emelk@ttnet.net.tr
authors.forename: Rahmi
authors.initials: R
authors.lastname: Köseoğlu
authors.forename: Fevzi
authors.initials: F
authors.lastname: Köksal
mesh_terms: D000818:Animals; D002119:Calcium Carbonate / Q000737:chemistry* / Q000528:radiation effects; D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals / Q000032:analysis* / Q000737:chemistry / Q000528:radiation effects; D005720:Gamma Rays; D006372:Helix, Snails / Q000737:chemistry* / Q000528:radiation effects; D008345:Manganese / Q000737:chemistry; D012016:Reference Values
chemical_list: D005609:Free Radicals; D008345:Manganese; D002119:Calcium Carbonate