title: Point defects and the blue emission in fired quartz at high doses: a comparative luminescence and EPR study.
abstract: The dose response of the 375 degrees C. 470 nm TL peak in fired quartz is studied by using thermoluminescence emission spectra and monochromatic glow curves. The blue emission displays a significant sensitivity increase for doses in excess of 1000 Gy, subsequent saturation at 16 kGy and a pre-dose effect over the entire dose range. Comparison with the growth of the known electron paramagnetic resonance (EPR) centres and radioluminescence emission spectra indicates that the [AlO4] centre is the recombination site for the blue emission, whereas the electron trap remains unknown. The sensitivity change seems to be linked to the dose-induced reduction of the [GeO4/Li] centre. Possible mechanisms for the observed dose response are discussed.
authors.affiliation: Forschungsstelle Radiometrie der Heidelberger Akademie der Wissenschaften, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Woda
authors.forename: T
authors.initials: T
authors.lastname: Schilles
authors.forename: U
authors.initials: U
authors.lastname: Rieser
authors.forename: A
authors.initials: A
authors.lastname: Mangini
authors.forename: G A
authors.initials: GA
authors.lastname: Wagner
mesh_terms: D004578:Electron Spin Resonance Spectroscopy; D008163:Luminescent Measurements; D011791:Quartz / Q000737:chemistry / Q000528:radiation effects*; D011854:Radiochemistry; D013053:Spectrophotometry; D013819:Thermoluminescent Dosimetry / Q000379:methods*
chemical_list: D011791:Quartz