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dc.typeArtigo de periódicopt_BR
dc.titleEvaluation Of Conversion Coefficients Relating Air-kerma To H∗(10) Using Primary And Transmitted X-ray Spectra In The Diagnostic Radiology Energy Rangept_BR
unicamp.authorZavanin, E.M., Department of Physics, University of Torino, Via P. Giuria 1, Torino, Italy, INFN, Sezione di Torino, Via P. Giuria 1, Torino, Italy, Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, UNICAMP, Rua Sérgio Buarque de Holanda 777, Campinas SP, Brazilpt_BR, S., Department of Physics, University of Torino, Via P. Giuria 1, Torino, Italy, INFN, Sezione di Torino, Via P. Giuria 1, Torino, Italypt, C., INFN, Sezione di Torino, Via P. Giuria 1, Torino, Italypt, M., Dipartimento di Fisica e Astronomia G. Galilei, Università di Padova, Italy, INFN, Sezione di Padova, Via F. Marzolo 8, Padova, Italypt, Y.F., Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, Chinapt
dc.description.abstractAccording to the International Commission on Radiation Units and Measurements (ICRU), the relationship between effective dose and incident air-kerma is complex and depends on the attenuation of x-rays in the body. Therefore, it is not practical to use this quantity for shielding design purposes. This correlation is adopted in practical situations by using conversion coefficients calculated using validated mathematical models by the ICRU. The ambient dose equivalent, H∗(10), is a quantity adopted by the IAEA for monitoring external exposure. Dose constraint levels are established in terms of H∗(10), while the radiation levels in radiometric surveys are calculated by means of the measurements of air-kerma with ion chambers. The resulting measurements are converted into ambient dose equivalents by conversion factors. In the present work, an experimental study of the relationship between the air-kerma and the operational quantity ambient dose equivalent was conducted using different experimental scenarios. This study was done by measuring the primary x-ray spectra and x-ray spectra transmitted through materials used in dedicated chest radiographic facilities, using a CdTe detector. The air-kerma to ambient dose equivalent conversion coefficients were calculated from these measured spectra. The resulting values of the quantity ambient dose equivalent using these conversion coefficients are more realistic than those available in the literature, because they consider the real energy distribution of primary and transmitted x-ray beams. The maximum difference between the obtained conversion coefficients and the constant value recommended in national and international radiation protection standards is 53.4%. The conclusion based on these results is that a constant coefficient may not be adequate for deriving the ambient dose equivalent. © 2016 IOP Publishing Ltd.en
dc.relation.ispartofJournal of Radiological Protectionpt_BR
dc.publisherInstitute of Physics Publishingpt_BR
dc.identifier.citationJournal Of Radiological Protection. Institute Of Physics Publishing, v. 36, p. 117 - 132, 2016.pt_BR
dc.description.provenanceMade available in DSpace on 2016-12-06T17:43:52Z (GMT). No. of bitstreams: 0 Previous issue date: 2016en
Appears in Collections:Unicamp - Artigos e Outros Documentos

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