title: Preparation-induced errors in EPR dosimetry of enamel: pre- and post-crushing sensitivity.
abstract: Polyakov et al. (1995) showed errors in dose estimation as a function of grain size for enamel grains given beta irradiation after crushing. We tested the effect of gamma irradiation applied to the specimens before and after crushing. We confirmed Polyakov's observations and found that post-crushing irradiation altered the slope of the dose-response curve of the hydroxyapatite signal and produced a grain-size-dependent offset. No changes in the slope of the dose-response curve were seen in enamel caps irradiated whole before crushing.
authors.affiliation: Division of Radiobiology, College of Medicine, University of Utah, Salt Lake City 84112, USA.
authors.forename: E H
authors.initials: EH
authors.lastname: Haskell
authors.forename: R B
authors.initials: RB
authors.lastname: Hayes
authors.forename: G H
authors.initials: GH
authors.lastname: Kenner
mesh_terms: D003743:Dental Enamel / Q000737:chemistry / Q000528:radiation effects*; D004307:Dose-Response Relationship, Radiation; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods* / Q000706:statistics & numerical data; D005069:Evaluation Studies as Topic; D005609:Free Radicals / Q000032:analysis / Q000528:radiation effects; D005720:Gamma Rays; D006801:Humans; D066298:In Vitro Techniques; D011874:Radiometry / Q000379:methods* / Q000706:statistics & numerical data
chemical_list: D005609:Free Radicals