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Ionization efficiencies of alanine dosimeters and tooth enamel irradiated by gamma and X-ray sources

Grun, Rainer; Mahat, Rosli; Joannes-Boyau, Renaud

Description

The relative ionisation efficiencies of alanine dosimeters and tooth enamel differ greatly between gamma and X-ray irradiations. This can be attributed to the differences in the energy transfer mechanisms. When using Co or Cs sources, the photon energy is transferred to matter via Compton scattering, which shows little dependence on the average Z-value of the absorber. In contrast, the photon energies emitted from X-ray sources are usually much lower and energy is, at least in part, transferred...[Show more]

dc.contributor.authorGrun, Rainer
dc.contributor.authorMahat, Rosli
dc.contributor.authorJoannes-Boyau, Renaud
dc.date.accessioned2015-12-13T22:17:36Z
dc.identifier.issn1350-4487
dc.identifier.urihttp://hdl.handle.net/1885/71238
dc.description.abstractThe relative ionisation efficiencies of alanine dosimeters and tooth enamel differ greatly between gamma and X-ray irradiations. This can be attributed to the differences in the energy transfer mechanisms. When using Co or Cs sources, the photon energy is transferred to matter via Compton scattering, which shows little dependence on the average Z-value of the absorber. In contrast, the photon energies emitted from X-ray sources are usually much lower and energy is, at least in part, transferred to matter via the photo-electric effect, which has a cubic relationship between energy transfer and average Z-value of the absorber. The decomposition of the ESR spectra of an enamel fragment shows that the X-ray generated distribution of anisotropic CO2- radicals is virtually the same as in the natural sample, but quite different to gamma irradiated samples. This implies that X-rays are generally much better suited for ESR dating irradiation procedures than gamma rays. However, exact source calibration will be difficult.
dc.publisherPergamon-Elsevier Ltd
dc.sourceRadiation Measurements
dc.subjectKeywords: Alanine; Alanine dosimeters; ESR spectra; Gamma irradiation; Ionization efficiency; Irradiated samples; Photon energy; Transfer mechanisms; X ray irradiation; X-ray sources; Amino acids; Carbon dioxide; Cesium; Electron sources; Electron spin resonance sp Alanine; ESR; Gamma irradiation; Tooth enamel; X-ray irradiation
dc.titleIonization efficiencies of alanine dosimeters and tooth enamel irradiated by gamma and X-ray sources
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume47
dc.date.issued2012
local.identifier.absfor040300 - GEOLOGY
local.identifier.ariespublicationf5625xPUB2623
local.type.statusPublished Version
local.contributor.affiliationGrun, Rainer, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationMahat, Rosli, University of Malaya
local.contributor.affiliationJoannes-Boyau, Renaud, Southern Cross University
local.description.embargo2037-12-31
local.bibliographicCitation.issue9
local.bibliographicCitation.startpage665
local.bibliographicCitation.lastpage668
local.identifier.doi10.1016/j.radmeas.2012.03.018
dc.date.updated2016-02-24T09:00:42Z
local.identifier.scopusID2-s2.0-84867043366
local.identifier.thomsonID000311532300004
CollectionsANU Research Publications

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