Development and Characterization of a New Cylindrical Ionization Chamber for Dosimetry of $^{60}{\rm Co}$ Beams

Neves, Lucio Pereira; Perini, Ana Paula; Caldas, Linda V.E.

doi:10.1109/tns.2012.2219319

Cited by 9 publications

(9 citation statements)

References 5 publications

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“…Based on the se lected quantiles of those dis tri bu tions, a so-called life time char ac ter istic can be con structed. Ex pe ri ence has shown that the life time char ac ter is tic forms a straight line on a dou ble log a rith mic scale [10][11][12]. If the con fi dence in ter vals of the used quantiles are known, they can be transferred to the life time char ac ter is tic.…”

Section: Dis Tri Bu Tion Func Tion Of the Break Down Time And The Brementioning

confidence: 99%

Lifetime characteristics of Gaiger-Muller counters

Kartalović

Perazić²,

Belic³

et al. 2016

NUCL TECH RAD PROT

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This paper discusses the process of functional aging of Geiger-Muller counters. Two types of Geiger-Muller counter chambers were characterized in an experiment using a combined constant voltage. Chamber A had a coaxial geometry and chamber B had a plan-parallel geometry. The experimental results indicate that the aging process was faster in the case of chambers with a coaxial geometry. The results are explained based on the process of electrical discharges in gasses.

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Section: Dis Tri Bu Tion Func Tion Of the Break Down Time And The Brementioning

confidence: 99%

Lifetime characteristics of Gaiger-Muller counters

Kartalović

Perazić²,

Belic³

et al. 2016

NUCL TECH RAD PROT

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“…At the Calibration Laboratory of IPEN the research group has developed several ionization chambers for radiation dosimetry in medical irradiation equipment (therapy and diagnostic energy range) and laboratory applications (as secondary standards) made with cheap accessible materials with high metrological performance [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…The ionization chamber investigated was the first one developed by the IPEN research group using the described mixture for the collecting electrode. The most common material utilized for the collecting electrodes of the IPEN ionization chambers was a uniformly spread graphite spray in various base types [11][12][13]17]. The mixture of colorless nail varnish and powered graphite was an alternative way for collecting electrode material because of its easy acquisition and application on a PMMA base with an excellent electrical conductivity [18].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of some dosimetric properties of a dedicated plane parallel ionization chamber for radiotherapy electron beams

Silva

Nonato

Sampaio³

et al. 2018

Braz. J. Rad. Sci.

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Ionization chambers are the reference detectors for electron beam dosimetry. In this paper a dedicated radiotherapy plane parallel ionization chamber manufactured with low cost materials is presented for dosimetry in electron beams. The ionization chamber tested has a sensitive volume of 0.4 cm³, and the collecting electrode and the guard ring were painted with a homogeneous mixture of nail polish and graphite. The dedicated ionization chamber presented linearity of the response with the absorbed dose in the range of 0.5 Gy to 8.0 Gy, an increase of the response with the field size increasing, an angular dependence within ±5°, as recommended by international standards, and a polarity effect of 0.78% with the field size. From the results obtained, it is possible to conclude that the plane parallel ionization chamber tested in this work presents potential use for electron beam dosimetry in clinical routine.

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“…Assim, centros de pesquisa como o Laboratório de Calibração de Instrumentos do IPEN (LCI) apresentam um histórico de projetos tecnológicos que se referem a metodologias dosimétricas e desenvolvimento de câmaras de ionização e de sistemas dosimétricos a partir de materiais nacionais de baixo custo [2][3][4][5].…”

Section: Introductionunclassified

Comparação entre duas câmaras de ionização do tipo lápis com comprimento de volume sensível de 30 cm

et al. 2017

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RESUMOA tomografia computadorizada (CT) vem crescendo devido aos avanços da tecnologia dos equipamentos, proporcionando uma dose maior no paciente, em relação aos demais exames de radiodiagnóstico, levando a uma preocupação com os pacientes. A dosimetria em CT é realizada com uma câmara de ionização do tipo lápis com comprimento de volume sensível de 10 cm. Os estudos têm mostrado a subestimação dos valores de dose. Foram desenvolvidas neste trabalho duas câmaras de ionização com comprimentos de volume sensível de 30 cm, que foram submetidas aos testes principais de caracterização, obtendo-se resultados dentro dos limites recomendáveis internacionalmente.Palavras-chave: Dosimetria, tomografia computadorizada, câmara de ionização especial. ABSTRACTComputed tomography (CT) for imaging procedures has been growing due to advances in the equipment technology, providing a higher dose to the patient, in relation to other diagnostic radiology tests, resulting in a concern for the patients. The dosimetry in CT is carried out with a pencil-type ionization chamber with sensitive volume length of 10 cm. Studies have shown the underestimation of the dose values. In this study two ionization chambers with the sensitive volume length of 30 cm were developed. They were submitted to the main characterization tests; the results showed to be within the international recommended limits.

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Development and Characterization of a New Cylindrical Ionization Chamber for Dosimetry of $^{60}{\rm Co}$ Beams

Cited by 9 publications

References 5 publications

Lifetime characteristics of Gaiger-Muller counters

Lifetime characteristics of Gaiger-Muller counters

Evaluation of some dosimetric properties of a dedicated plane parallel ionization chamber for radiotherapy electron beams

Comparação entre duas câmaras de ionização do tipo lápis com comprimento de volume sensível de 30 cm

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