Density- normalized first Townsend ionization coefficients in a CH4-based tissue-equivalent gas mixture
Carregando...
Data
Data de publicação
2016
Orientador
Título da Revista
ISSN da Revista
Título do Volume
É parte de
É parte de
É parte de
É parte de
IEEE NUCLEAR SCIENCE SYMPOSIUM
Exportar
Resumo
Since 1950 methane-based tissue-equivalent gas (TEG) mixtures have been employed at low
pressure in gaseous microdosimeters, such as tissue-equivalent proportional counters.
Nevertheless, values of the first Townsend ionization coefficient (α) for these mixtures are scarce
in the literature. In this work measurements of α as a function of the density-normalized electric
field (E/N) were carried out in a methane-based TEG (CH4 - 64.4%, CO2 - 32.4% and N2 - 3.2%)
in the range 100-300Td. The values of α were obtained using the Pulsed Townsend Technique by
measuring the current growth as a function of the electric field strength in a Resistive Plate
Chamber structure. Because of the parallel plate geometry, the field is uniform in our setup. As
far as the authors are aware, there is only one set of experimental data on α for CH4-TEG
published by Schmitz and Booz for reduced field strengths between 110V.cm-1.torr-1 (≈ 315Td)
and 1780V.cm-1.torr-1 (≈ 5045Td). However, they employed a cylindrical proportional counter
where α /p values were gathered from measurements of the gas gain resulting from an interval of
electric field strengths. Because there are no data on α in methane-based TEG in the E/N range
herein investigated, our results were compared with those expected from Magboltz simulations.
Good agreement was found between experimental and simulated values of density-normalized α.
Como referenciar
PETRI, A.R.; MANGIAROTTI, A.; GONÇALVES, J.A.C.; BUENO, C.C. Density- normalized first Townsend ionization coefficients in a CH4-based tissue-equivalent gas mixture. In: IEEE NUCLEAR SCIENCE SYMPOSIUM, October 29 - November 5, 2016, Strasbourg, France. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/27333. Acesso em: 20 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.