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Title: The Effect of Gamma Irradiation on Space Charge Behaviour and Dielectric Spectroscopy of Low-density Polyethylene
Authors: Fu, Mingli
Chen, George
Dissado, Len A.
Fothergill, John C.
Zou, Chen
First Published: Jul-2007
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Citation: IEEE International Conference on Solid Dielectrics, 2007 - Proceedings of, pp. 442-445
Abstract: The influence of gamma irradiation on low-density polyethylene (LDPE) has been studied through space charge measurement and dielectric spectroscopy. Commercial LDPE film with a thickness of 100μm was irradiated with γ-rays at a dose rate of approximately 10kGy/h to different doses up to 100kGy in an atmosphere of air, vacuum and nitrogen respectively. Space charge profiles vary depending on irradiation environments and radiation dose. The space charge profile of a sample after irradiation at 100kGy in air is more complicated than those irradiated in vacuum and nitrogen at same dose. More importantly, the space charge decay rate for the irradiated samples is slower than that of the virgin sample, indicating that the irradiation had changed the material by the generation of deep traps for space charge. Irradiation in air also produced changes in the dielectric spectrum in the frequency range between 10-3Hz and 106Hz where the imaginary part of the permittivity was found to be about one order of magnitude higher than that of the virgin sample (~10-4). This was attributed to oxidation as samples with the same (or lower) radiation dose in vacuum or nitrogen showed no pronounced difference to that of virgin samples.
DOI Link: 10.1109/ICSD.2007.4290846
ISBN: 1424407516
Type: Conference paper
Rights: This is the author's final draft of the paper published as IEEE International Conference on Solid Dielectrics, 2007 - Proceedings of, pp. 442-445. Copyright © 2007 IEEE. The final version is available from Doi: 10.1109/ICSD.2007.4290846. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Leicester’s products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to By choosing to view this document, you agree to all provisions of the copyright laws protecting it.
Appears in Collections:Conference Papers & Presentations, Dept. of Engineering

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