title: A new ESR dosimeter based on bioglass material.
abstract: Bioglass (Bio-G) samples were irradiated with 60Co gamma-rays to study radicals for dosimetric materials with electron spin resonance (ESR). The ESR spectrum of Bio-G is characterized by two main signals. The first signal at g approximately = 4.3 corresponds to Fe3+ impurities and the second signal at g approximately = 2.0130 with line-width 10.85 G is ascribed as a hole center. The gamma-ray dose response and thermal stability were studied to establish the suitability of bioglass as an ESR dosimeter. A radical formation efficiency, G-value, of 0.53 +/- 0.11 was obtained. The lifetime of radicals and the activation energy were estimated from Arrhenius plots to be approximately 255 +/- 46 days and 0.71 eV, respectively.
authors.affiliation: Department of Ionizing Radiation Metrology, National Institute for Standards (NIS), Cairo, Egypt. gamalhassan65@hotmail.com
authors.forename: Gamal M
authors.initials: GM
authors.lastname: Hassan
authors.forename: M A
authors.initials: MA
authors.lastname: Sharaf
authors.forename: Omar S
authors.initials: OS
authors.lastname: Desouky
mesh_terms: D001672:Biocompatible Materials / Q000528:radiation effects*; D001843:Bone Cements / Q000528:radiation effects*; D002516:Ceramics / Q000528:radiation effects*; D003037:Cobalt Radioisotopes; D004307:Dose-Response Relationship, Radiation; D004578:Electron Spin Resonance Spectroscopy; D005720:Gamma Rays; D007700:Kinetics; D011829:Radiation Dosage
chemical_list: D001672:Biocompatible Materials; C022107:Bioglass; D001843:Bone Cements; D003037:Cobalt Radioisotopes