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...
Main Authors: | , , |
---|---|
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 |
_version_ | 1819173289112633344 |
---|---|
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. |
first_indexed | 2024-12-22T20:20:42Z |
format | Article |
id | doaj.art-950def49fbda43d2bff00cf008046f70 |
institution | Directory Open Access Journal |
issn | 2010-135X 2010-1368 |
language | English |
last_indexed | 2024-12-22T20:20:42Z |
publishDate | 2019-12-01 |
publisher | World Scientific Publishing |
record_format | Article |
series | Journal of Advanced Dielectrics |
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 |
work_keys_str_mv | AT akomeijani surfacepotentialuniformityandsensitivityoflargeareaptfeelectretdiscsofdifferentthicknessesproducedbyamodifiedcoronapolingrotatingsystemfordosimetryapplications AT hbagheri surfacepotentialuniformityandsensitivityoflargeareaptfeelectretdiscsofdifferentthicknessesproducedbyamodifiedcoronapolingrotatingsystemfordosimetryapplications AT bshekarchi surfacepotentialuniformityandsensitivityoflargeareaptfeelectretdiscsofdifferentthicknessesproducedbyamodifiedcoronapolingrotatingsystemfordosimetryapplications |