Spelling suggestions: "subject:"ionization chamber""
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Aplicação de câmaras de ionização especiais para controle de qualidade em mamografia / Application of special ionization chambers for quality control in mammographyCristiane Jordão de Carvalho Honda 19 August 2015 (has links)
A mamografia é um exame realizado no mamógrafo, que utiliza raios X para obter imagens da anatomia interna da mama. Para que esta imagem seja capaz de fornecer um diagnóstico correto, é necessário que os equipamentos passem constantemente por programas de controle de qualidade para que se possa garantir que as pacientes submetidas a este exame não estejam recebendo dose além da necessária, evitando-se assim possíveis efeitos biológicos indesejados. As câmaras de ionização são detectores muito utilizados para se realizar o controle de qualidade de equipamentos que utilizam radiação, como os mamógrafos. No presente trabalho foram utilizadas quatro câmaras de ionização desenvolvidas no Laboratório de Calibração de Instrumentos do IPEN LCI/IPEN, que foram submetidas a testes de caracterização em feixes padrões de radiação X do LCI. Elas apresentaram resultados satisfatórios, dentro dos limites estabelecidos pelas normas nacionais e internacionais. Como aplicação, estas câmaras de ionização foram utilizadas para testes de controle de qualidade em quatro mamógrafos clínicos de diferentes instituições quanto à repetibilidade e linearidade da taxa de kerma no ar. Os resultados obtidos nestes testes encontram-se dentro dos limites recomendados pelas normas nacionais e internacionais. / Mammography is an examination in mammography, which uses X-rays to obtain images of the internal anatomy of the breast. To provide a correct diagnosis, it is necessary that the equipment constantly undergo quality control programs to ensure that patients submitted to this examination do not receive more than the necessary dose, thus avoiding unwanted possible biological effects. The ionization chambers are widely used detectors to perform the quality control program of equipment with radiation, as mammographers. In the present study, four different special ionization chambers, developed at the Calibration Laboratory of Instruments of IPEN - LCI / IPEN, were submitted to the characterization tests in standard X radiation beams at the LCI. The results were satisfactory, within the limits estabilished by national and international standards. As an application, the ionization chambers were used for quality control tests in four mammography clinics from different institutions, as the repeatability and linearity of the air kerma rate. The results obtained in these tests were within the limits recommended by national and international standards.
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Ultraviolet aurora and airglowO'Conner, Graham Geoffrey January 1973 (has links)
[11] 212 leaves : ill., plates ; 26 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.1974) from the Dept. of Physics, University of Adelaide
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The development of new devices for accurate radiation dose measurement a guarded liquid ionization chamber and an electron sealed water calorimeter /Stewart, Kristin J. January 1900 (has links)
Thesis (Ph.D.). / Written for the Dept. of Physics. Title from title page of PDF (viewed 2008/01/11). Includes bibliographical references.
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Monte Carlo investigation of the influence of ion chamber response on in-air measurements in megavoltage photon beams /Tonkopi, Elena. January 1900 (has links)
Thesis (M.Sc.) - Carleton University, 2005. / Includes bibliographical references (p. 71-77). Also available in electronic format on the Internet.
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Solid state control circuit for an incipient conbustion [sic] ionization chamber detectorKlein, Carl Frederick, January 1967 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1967. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
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High-energy induced fission theory and applicationHart, Robert R. January 1955 (has links)
Thesis (M.S. in Physics)--United States Naval Postgraduate School, California. / "Unclassified Physics." Includes bibliographical references (p. 36). 14
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Estudo parametrico de detectores a gasFITAS, INACIO R. 09 October 2014 (has links)
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05065.pdf: 3573902 bytes, checksum: fa9368ab741a4e14bd802e16f0bbd409 (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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Estabelecimento de um novo metodo de calibracao de camaras de ionizacao tipo lapis para dosimetria em feixes de tomografia computadorizada / Establishment of a new calibration method of pencil ionization chamber for dosimetry in computed tomographyDIAS, DANIEL M. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:28:45Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:57:14Z (GMT). No. of bitstreams: 0 / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Caracterizacao das qualidades de radiacao X segundo as recomendacoes da norma IEC 61267 no Laboratorio de Calibracao do IPEN / X radiation qualities characterization following the standard IEC 61267 recommendations at the calibration laboratory of IPENFRANCISCATTO, PRISCILA C. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:26:57Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:58:20Z (GMT). No. of bitstreams: 0 / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Calibracao de um sistema de camara de ionizacao de poco 4'pi'-'gamma' para medidas de atividade de radio-nuclideosDIAS, M.S. 09 October 2014 (has links)
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00830.pdf: 1838856 bytes, checksum: 0f6a3f75b210d4e73e342ebf7544cc17 (MD5) / Dissertacao (Mestrado) / IEA/D / Escola Politecnica, Universidade de Sao Paulo - POLI/USP
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