Measurement of the first Townsend ionization coefficient in a methane-based tissue-equivalent gas
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2017
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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
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Tissue-equivalent gases (TEGs), often made of a hydrocarbon, nitrogen, and carbon dioxide, have been
employed in microdosimetry for decades. However, data on the first Townsend ionization coefficient (α) in such
mixtures are scarce, regardless of the chosen hydrocarbon. In this context, measurements of α in a methanebased
tissue-equivalent gas (CH4 – 64.4%, CO2 – 32.4%, and N2 – 3.2%) were performed in a uniform field
configuration for density-normalized electric fields (E/N) up to 290 Td. The setup adopted in our previous
works was improved for operating at low pressures. The modifications introduced in the apparatus and the
experimental technique were validated by comparing our results of the first Townsend ionization coefficient in
nitrogen, carbon dioxide, and methane with those from the literature and Magboltz simulations. The behavior of
α in the methane-based TEG was consistent with that observed for pure methane. All the experimental results
are included in tabular form in the Supplementary material.
Como referenciar
PETRI, A.R.; GONÇALVES, J.A.C.; MANGIAROTTI, A.; BOTELHO, S.; BUENO, C.C. Measurement of the first Townsend ionization coefficient in a methane-based tissue-equivalent gas. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, v. 849, p. 31-40, 2017. DOI: 10.1016/j.nima.2017.01.007. Disponível em: http://repositorio.ipen.br/handle/123456789/27385. Acesso em: 18 Apr 2024.
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