Detection of free radicals in gamma-irradiated seasnail hard tissues by electron paramagnetic resonance

Koseoglu R., Koksal F.

APPLIED RADIATION AND ISOTOPES, vol.59, no.1, pp.73-77, 2003 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 59 Issue: 1
  • Publication Date: 2003
  • Doi Number: 10.1016/s0969-8043(03)00124-6
  • Journal Name: APPLIED RADIATION AND ISOTOPES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.73-77
  • Keywords: free radicals, gamma-irradiation, snail, EPR, electron paramagnetic resonance, Mn2+, SINGLE-CRYSTAL CALCITE, SPIN-RESONANCE, TOOTH ENAMEL, ABSORPTION SPECTRUM, CARBONATED APATITES, MOLECULE-IONS, ESR-SPECTRA, EPR, CO2, CO2-MOLECULE-IONS
  • Ondokuz Mayıs University Affiliated: No

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-. O-2(-), freely rotating C-. O-2(-), orthorhombic C-. O-3(-), axial C-. O-3(-), and axial C-. O-3(3-) free radicals. Unirradiated seasnail hard tissues also feature Mn2+ ions in their EPR spectra. The hyperfine values were determined for the C-13 nucleus in the orthorhombic C-. O-2(-) and axial C-. O-3(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. (C) 2003 Elsevier Ltd. All rights reserved.