Surface potential uniformity and sensitivity of large-area PTFE electret discs of different thicknesses produced by a modified corona poling rotating system for dosimetry applications

In this study, large-area (6-cm diameter) Teflon polytetrafluoroethylene (PTFE) discs of different thicknesses (0.2-, 0.5- and 1 -mm) were negatively and positively charged by using the “modified single point-to-plane corona poling rotating system”. The effects of some crucial parameters of the PTFE...

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Main Authors: A. Komeijani, H. Bagheri, B. Shekarchi
Format: Article
Language:English
Published: World Scientific Publishing 2019-12-01
Series:Journal of Advanced Dielectrics
Subjects:
Online Access:http://www.worldscientific.com/doi/pdf/10.1142/S2010135X19500504
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author A. Komeijani
H. Bagheri
B. Shekarchi
author_facet A. Komeijani
H. Bagheri
B. Shekarchi
author_sort A. Komeijani
collection DOAJ
description In this study, large-area (6-cm diameter) Teflon polytetrafluoroethylene (PTFE) discs of different thicknesses (0.2-, 0.5- and 1 -mm) were negatively and positively charged by using the “modified single point-to-plane corona poling rotating system”. The effects of some crucial parameters of the PTFE disc as well as the modified corona poling rotating system on the PTFE surface potential uniformity such as: (a) PTFE disc thickness, (b) PTFE disc polarity and (c) needle-to-PTFE disc distance were successfully reported. Accordingly, closer needle-to-PTFE disc distance, positive charging mode and thinner PTFE disc provided a better PTFE surface potential uniformity. However, the effects of PTFE charge polarity and needle distance on the electrostatic charge potential uniformity were much more remarkable in comparison with the effects of PTFE thickness. Additionally, the surface potential distribution profiles of charged PTFE discs were totally flat and independent of the PTFE thickness at 5- and 13-mm needle distances for the negative and positive charging modes, respectively. At the optimized charging conditions, large-area PTFE electret disc (0.5-mm-thick) with positive uniform surface charge potential especially at the edges up to ∼ 1.8kV with stability up to 77 days studied was produced by applying a new multiple heat treatment protocol to the PTFE disc for radon dosimetry. As also observed in this study, the sensitivity of PTFE electret dosimeters to a defined radon gas concentration increases as the PTFE thickness increases. Meanwhile, 0.5-mm-thick PTFE electret disc produced was selected to be used as a high quality electret dosimeter with acceptable and superior parameters for different applications in particular medium-term radiation dosimetry in both low and high dose rate ionizing radiation fields.
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spelling doaj.art-950def49fbda43d2bff00cf008046f702022-12-21T18:13:52ZengWorld Scientific PublishingJournal of Advanced Dielectrics2010-135X2010-13682019-12-01961950050-11950050-1110.1142/S2010135X1950050410.1142/S2010135X19500504Surface potential uniformity and sensitivity of large-area PTFE electret discs of different thicknesses produced by a modified corona poling rotating system for dosimetry applicationsA. Komeijani0H. Bagheri1B. Shekarchi2AJA Radiation Sciences Research Center (ARSRC), Science and Research Branch, AJA University of Medical Sciences, Tehran, IranAJA Radiation Sciences Research Center (ARSRC), Science and Research Branch, AJA University of Medical Sciences, Tehran, IranAJA Radiation Sciences Research Center (ARSRC), Science and Research Branch, AJA University of Medical Sciences, Tehran, IranIn this study, large-area (6-cm diameter) Teflon polytetrafluoroethylene (PTFE) discs of different thicknesses (0.2-, 0.5- and 1 -mm) were negatively and positively charged by using the “modified single point-to-plane corona poling rotating system”. The effects of some crucial parameters of the PTFE disc as well as the modified corona poling rotating system on the PTFE surface potential uniformity such as: (a) PTFE disc thickness, (b) PTFE disc polarity and (c) needle-to-PTFE disc distance were successfully reported. Accordingly, closer needle-to-PTFE disc distance, positive charging mode and thinner PTFE disc provided a better PTFE surface potential uniformity. However, the effects of PTFE charge polarity and needle distance on the electrostatic charge potential uniformity were much more remarkable in comparison with the effects of PTFE thickness. Additionally, the surface potential distribution profiles of charged PTFE discs were totally flat and independent of the PTFE thickness at 5- and 13-mm needle distances for the negative and positive charging modes, respectively. At the optimized charging conditions, large-area PTFE electret disc (0.5-mm-thick) with positive uniform surface charge potential especially at the edges up to ∼ 1.8kV with stability up to 77 days studied was produced by applying a new multiple heat treatment protocol to the PTFE disc for radon dosimetry. As also observed in this study, the sensitivity of PTFE electret dosimeters to a defined radon gas concentration increases as the PTFE thickness increases. Meanwhile, 0.5-mm-thick PTFE electret disc produced was selected to be used as a high quality electret dosimeter with acceptable and superior parameters for different applications in particular medium-term radiation dosimetry in both low and high dose rate ionizing radiation fields.http://www.worldscientific.com/doi/pdf/10.1142/S2010135X19500504ptfe electretsdielectric polarizationsurface charge uniformity and stabilityelectrostatic discharges and measurementsdosimetry
spellingShingle A. Komeijani
H. Bagheri
B. Shekarchi
Surface potential uniformity and sensitivity of large-area PTFE electret discs of different thicknesses produced by a modified corona poling rotating system for dosimetry applications
Journal of Advanced Dielectrics
ptfe electrets
dielectric polarization
surface charge uniformity and stability
electrostatic discharges and measurements
dosimetry
title Surface potential uniformity and sensitivity of large-area PTFE electret discs of different thicknesses produced by a modified corona poling rotating system for dosimetry applications
title_full Surface potential uniformity and sensitivity of large-area PTFE electret discs of different thicknesses produced by a modified corona poling rotating system for dosimetry applications
title_fullStr Surface potential uniformity and sensitivity of large-area PTFE electret discs of different thicknesses produced by a modified corona poling rotating system for dosimetry applications
title_full_unstemmed Surface potential uniformity and sensitivity of large-area PTFE electret discs of different thicknesses produced by a modified corona poling rotating system for dosimetry applications
title_short Surface potential uniformity and sensitivity of large-area PTFE electret discs of different thicknesses produced by a modified corona poling rotating system for dosimetry applications
title_sort surface potential uniformity and sensitivity of large area ptfe electret discs of different thicknesses produced by a modified corona poling rotating system for dosimetry applications
topic ptfe electrets
dielectric polarization
surface charge uniformity and stability
electrostatic discharges and measurements
dosimetry
url http://www.worldscientific.com/doi/pdf/10.1142/S2010135X19500504
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