Operation of gas electron multiplier (GEM) with propane gas at low pressure and comparison with tissue-equivalent gas mixtures

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• 作者：L. De Nardo^a ; ^{laura.denardo@unipd.it" class="auth_mail" title="E-mail the corresponding author} ; M. Farahmand^b ; ^{majid.farahmand@rivm.nl" class="auth_mail" title="E-mail the corresponding author}
• 关键词：GEM ; Gas Electron Multiplier ; THGEM ; Thick Gas Electron Multiplier ; TE ; Tissue-Equivalent ; TEPC ; Tissue-Equivalent proportional Counter ; TE-CH4 ; methane-based Tissue-Equivalent gas mixture ; TE-C3H8 ; propane-based Tissue-Equivalent gas mixture ; SV ; sensitive volume ; PCB ; printed circuit board ; cps ; count per second ; FWHM ; Full Width at Half Maximum ; ENC ; equivalent noise charge
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2016
• 出版时间：21 May 2016
• 年：2016
• 卷：819
• 期：Complete
• 页码：154-162
• 全文大小：1705 K

文摘

A Tissue-Equivalent Proportional Counter (TEPC), based on a single GEM foil of standard geometry, has been tested with pure propane gas at low pressure, in order to simulate a tissue site of about 1 µm equivalent size. In this work, the performance of GEM with propane gas at a pressure of 21 and 28 kPa will be presented. The effective gas gain was measured in various conditions using a ²⁴⁴Cm alpha source. The dependence of effective gain on the electric field strength along the GEM channel and in the drift and induction region was investigated. A maximum effective gain of about 5×10³ has been reached. Results obtained in pure propane gas are compared with gas gain measurements in gas mixtures commonly employed in microdosimetry, that is propane and methane based Tissue-Equivalent gas mixtures.