title: Elimination of the background signal in tooth enamel samples for EPR-dosimetry by means of physical-chemical treatment.
abstract: A method of elimination of the background EPR signal in tooth enamel is proposed. This method implies treatment of enamel powder by highly active reduction reagent hydrazine with subsequent washing out by ethanol-water solution. Such treatment results in reducing both the native background signal (which is assumed to be originated by the organic component) and the mechanical induced EPR signal in enamel. Testing of the efficiency of hydrazine treatment is made for different sizes of enamel powder. It is shown that the optimal results are obtained for a powder fraction of about 100-200 microm. The radiation-induced EPR signal in enamel is practically not changed after treatment by hydrazine.
authors.affiliation: Medical Radiological Research Centre of RAMS, Obninsk, Russia. ivann@mail.ru
authors.forename: A I
authors.initials: AI
authors.lastname: Ivannikov
authors.forename: D D
authors.initials: DD
authors.lastname: Tikunov
authors.forename: V G
authors.initials: VG
authors.lastname: Skvortsov
authors.forename: V F
authors.initials: VF
authors.lastname: Stepanenko
authors.forename: V V
authors.initials: VV
authors.lastname: Khomichyonok
authors.forename: L G
authors.initials: LG
authors.lastname: Khamidova
authors.forename: D D
authors.initials: DD
authors.lastname: Skripnik
authors.forename: L L
authors.initials: LL
authors.lastname: Bozadjiev
authors.forename: M
authors.initials: M
authors.lastname: Hoshi
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003743:Dental Enamel / Q000737:chemistry* / Q000528:radiation effects*; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods* / Q000706:statistics & numerical data; D005720:Gamma Rays; D006801:Humans; D006834:Hydrazines; D007202:Indicators and Reagents; D011208:Powders; D011854:Radiochemistry; D011874:Radiometry / Q000379:methods* / Q000706:statistics & numerical data; D015203:Reproducibility of Results
chemical_list: D006834:Hydrazines; D007202:Indicators and Reagents; D011208:Powders; C029424:hydrazine