title: Single-aliquot EPR dosimetry of wallboard (drywall).
abstract: Electron paramagnetic resonance spectra and dose-response curves are presented for a variety of wallboard samples obtained from different manufacturing facilities, as well as for source gypsum and anhydrite. The intensity of the CO(3)(-) paramagnetic centre (G2) is enhanced with gamma radiation. Isothermal decay curves are used to propose annealing methods for the removal of the radiosensitive CO(3)(-) radical without affecting the unirradiated baseline. Post-irradiation annealing of wallboard prevents recuperation of the radiosensitive CO(3)(-) radical with additional irradiation. A single-aliquot additive dose procedure is developed that successfully measures test doses as low as 0.76 Gy.
authors.affiliation: Atomic Energy of Canada Limited, Chalk River Laboratories, Chalk River, ON, Canada.
authors.forename: R
authors.initials: R
authors.lastname: Mistry
authors.forename: J W
authors.initials: JW
authors.lastname: Thompson
authors.forename: D R
authors.initials: DR
authors.lastname: Boreham
authors.forename: W J
authors.initials: WJ
authors.lastname: Rink
mesh_terms: D002133:Calcium Sulfate / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy; D005720:Gamma Rays; D006801:Humans; D011829:Radiation Dosage; D011874:Radiometry
chemical_list: D003764:Dental Materials; D002133:Calcium Sulfate