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Browsing Metrologia das radiações ionizantes: Produção Científica by Title

Browsing Metrologia das radiações ionizantes: Produção Científica by Title

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  • Levantamento radiométrico em mamografia: problemas e desafios 
    Navarro, Marcus Vinícius Teixeira; Navarro, Valéria Coêlho Costa; Garcia, Igor Fernando Modesto; Ferreira, Mário de Jesus; Macedo, E. M. (2015)
    Além de ser obrigatório, o levantamento radiométrico continua sendo uma necessidade devido a construção de salas cada vez menores, podendo as condições de calibração, a instrumentação e seu uso, produzirem fatores subestimados. ...
  • Mammography calibration qualities establishment in a Mo-Mo clinical system 
    Correa, Eduardo de Lima; Santos, Lucas Rodrigues dos; Vivolo, Vitor; Potiens, Maria da Penha Albuquerque (2015)
    In this study the mammography calibration qualities were established in a clinical mammography system. The objective is to provide the IPEN instruments calibration laboratory with both mammography calibration methods (using ...
  • MCNP simulation of the incident and albedo neutron response of the IRD albedo neutron dosemeter for 241Am–Be moderated sources 
    Freitas, Bruno Mendes; Martins, Marcelo Marques; Silva, Ademir Xavier da; Mauricio, Claudia Lucia de Pinho (2015)
    The IRD TLD albedo dosemeter measures both incident and albedo neutron component. The incident to albedo ratio is used to take into account the energy dependence of its response. In this paper, the behavior of the IRD ...
  • Metrological activity determination of 133Ba by sum-peak absolute method 
    Silva, Ronaldo Lins da; Almeida, Maria Candida Moreira de; Delgado, José Ubiratan; Poledna, Roberto; Santos, A.; Veras, E. V.; Rangel, J.; Trindade, O. L. (2015)
    The National Laboratory for Metrology of Ionizing Radiation provides gamma sources of radionuclide and standardized in activity with reduced uncertainties. Relative methods require standards to determine the sample activity ...
  • Padronização absoluta do 65Zn pelo método de anticoincidência 4πβ-γ 
    Santos, Anderson Ricardo Leiras dos; Silva, Carlos José da; Delgado, José Ubiratan; Tavares, Desiree Yael de Sena; Silva, Ronaldo L. da; Poledna, Roberto; Iwahara, Akira (2017)
    Uma solução de 65Zn foi padronizada usando o método absoluto de contagem em anticoincidência 4πβ(LS)-γ(NaI) e técnica de extrapolação de eficiência beta pelo Laboratório Nacional de Metrologia das Radiações Ionizantes no ...
  • Performance of the participant laboratories in the national intercomparison program (PNI) in the period from 1991 to 2013 
    Tauhata, Luiz; Vianna, Maria Elizabeth Couto Machado; Oliveira, Antonio Eduardo de; Bragança, Maura Julia Câmara da Silva; Ferreira, Ana Cristina de Melo (2015)
    The statistical evaluation of the data of 23 years of the Brazilian Intercomparison Program shows the performance of the 24 Participant Laboratories of the country in the determination of 29 radionuclides in 10600 spiked ...
  • A portable detection system for in vivo monitoring of 131I in routine and emergency situations 
    Dantas, Bernardo Maranhão; Lucena, Eder Augusto de; Dantas, Ana Letícia Almeida (2017)
    In vivo monitoring of 131I in human thyroid is often used to evaluate occupational exposure in nuclear medicine facilities and in the case of accidental intakes in nuclear power plants for the monitoring of workers and ...
  • Pressure sound level measurements at an educational environment in Goiania, Goias, Brazil 
    Caldas, Linda Viola Ehlin; Costa, Jhonatha Junio Lopes; Oliveira, Lucas Nonato de; Nascimento, Eriberto Oliveira do (2017)
    In this work, twenty five points located on the ground floor of the Federal Institute of Education, Science and Technology of Goias - IFG - Campus Goiania, were analyzed in morning periods of two Saturdays. The pressure ...
  • Primary standardization of 152Eu by 4πβ(LS) – γ (NaI) coincidence counting and CIEMAT-NIST method 
    Ruzzarin, Anelise; Cruz, Paulo Alberto Lima da; Ferreira Filho, Alfredo Lopes; Iwahara, Akira (2017)
    The 4πβ-γ coincidence counting and CIEMAT/NIST liquid scintillation method were used in the standardization of a solution of 152Eu. In CIEMAT/NIST method, measurements were performed in a Liquid Scintillation Counter model ...
  • Reference factor F(CT)Q and x ray tube ionization yield R(TUBE)Q 
    Quaresma, Daniel da Silva; Cardoso, Ricardo de Souza; Peixoto, José Guilherme Pereira (2015)
    The operational facility procedures in diagnostic radiology standardization and calibration, through the relation between the X ray tube current and the ionization chamber current in a radiation quality Q, shown the reference ...
  • Reliability of an x-ray system for calibrating and testing personal radiation dosimeters 
    Guimarães, Margarete Cristina; Silva, Claudete Roberta Evangelista Silva; Rosado, Paulo Henrique G.; Cunha, Paulo Gonçalves; Silva, Teogenes Augusto da (2017)
    Metrology laboratories are expected to maintain standardized radiation beams and traceable standard dosimeters to provide reliable calibrations or testing of detectors. Results of the characterization of an x-ray system ...
  • Results of an innovative methodology to the dosimetry in mammography examinations 
    Feital, João Carlos da Silva; Delgado, José Ubiratan; Peixoto, José Guilherme Pereira; Lopes, Ricardo Tadeu (2015)
    Female breast is a radiosensitive organ and the main procedure to assess the carcinogenic risk associated the mammographic practices has been indicated by the mean glandular dose (MGD) measurements. However, this dosimetric ...
  • Simulação de um tubo de raios X clínico através do método de Monte Carlo usando código PENELOPE 
    Albuquerque, Marcos Aurélio Gomes de; David, Mariano Gazineu; Almeida, Carlos Eduardo de; Bernal, Mario; Magalhães, Luis Alexandre Gonçalves; Braz, Delson (2015)
    O câncer de mama é o tipo de neoplasia mais freqüente entre mulheres. A principal técnica de detecção precoce do câncer de mama é a mamografia. Apesar do avanço da diminuição das mortes por câncer, existe a preocupação dos ...
  • Stereotactic radiotherapy for choroidal melanoma: analysis of eye movement during treatment 
    Souza, Felipe Marques Lucas de; Gonçalves, Odair Dias; Batista, Delano Valdivino Santos; Coutinho, Simone Cardoso (2017)
    This study aims to analyze the eye’s movement during radiotherapy treatment for choroidal melanoma, as well as the methodology used in the repositioning of the patient between treatments sessions. For this purpose, the ...
  • A study to assess the long-term stability of the ionization chamber reference system in the LNMRI 
    Trindade Filho, Octavio Luiz; Conceição, Dayana Azeredo da; Oliveira, Antonio Eduardo de; Delgado, José Ubiratan; Iwahara, Akira; Silva, Carlos José da; Tauhata, Luiz (2017)
    Ionization chambers are used as secondary standard in order to maintain the calibration factors of radionuclides in the activity measurements in metrology laboratories. Used as radionuclide calibrator in nuclear medicine ...
  • TDCR and CIEMAT/NIST liquid scintillation methods applied to the radionuclide metrology 
    Cruz, Paulo Alberto Lima da; Silva, Carlos José da; Iwahara, Akira; Loureiro, Jamir dos Santos; Oliveira, Antônio Eduardo de; Tauhata, Luiz; Lopes, Ricardo Tadeu (2015)
    In this work are presented TDCR and CIEMAT/NIST methods of liquid scintillation implemented in National Institutes of Metrology for activity standardization of radionuclides which decay by beta emission and electron capture. ...
  • The quantity time relation in the ionizing radiations 
    Jordão, Bruno de Oliveira; Peixoto, José Guilherme Pereira; Quaresma, Daniel da Silva (2017)
    The area of metrology has taken a step forward with regard to the calculation of uncertainty. This mathematical tool used in laboratories is essential to ensure that the values resulting from a measurement are reliable. ...
  • Uso do código de Monte Carlo MCNP para caracterização de uma câmara de ionização tipo lápis 
    Perini, Ana Paula; Mendonça, Dalila Souza Costa; Neves, Lucio Pereira; Santos, William de Souza; Caldas, Linda Viola Ehlin (2017)
    Câmaras de ionização são muito utilizadas para dosimetria de feixes de radiodiagnóstico. Neste trabalho uma câmara de ionização tipo lápis especial, com dimensões, configuração e materiais diferentes em relação às câmaras ...

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