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Electrical conduction in irradiated low-density polyethylene

Electrical conduction in irradiated low-density polyethylene
Electrical conduction in irradiated low-density polyethylene
A programme of experiments has been undertaken to examine transient charging/discharging currents and steady state currents in low-density polyethylene (LDPE) under the application of direct fields. This has been undertaken for pristine material and for material which has received doses of radiation between 104 and 106 Gy from either a 60Co γ-source or a research reactor. The material was irradiated in ambient air or dry nitrogen. Measurements were made for applied fields in the range 6.7 × 105-5.3 × 107 V m -1 and temperatures between ambient and 90°C. With pristine material at low fields, transient charging/discharging currents decreased monotonically with time. However, the mechanism changed at higher fields with a peak occurring in the charging transient indicating a space-charge limited process. Substantial charge injection was also in evidence as demonstrated by anomalous discharging currents. This transient response was echoed by the current/voltage characteristics of steady state behaviour. Gamma and neutron irradiation brought about a change in this situation and the charge transport mechanism altered gradually from space-charge-limited conduction to an ohmic process with increasing dose. The role played by charge traps appears to be significant.
1359-0197
401-410
Banford, H.M.
9dc60d5b-0f57-45cf-a31a-796e245cd0d8
Fouracre, R.A.
0a81ea9c-2a89-4612-9d23-40576d8bb90f
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Tedford, D.J.
057c7668-1e99-4bbf-a540-b3795396d376
Banford, H.M.
9dc60d5b-0f57-45cf-a31a-796e245cd0d8
Fouracre, R.A.
0a81ea9c-2a89-4612-9d23-40576d8bb90f
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Tedford, D.J.
057c7668-1e99-4bbf-a540-b3795396d376

Banford, H.M., Fouracre, R.A., Chen, G. and Tedford, D.J. (1992) Electrical conduction in irradiated low-density polyethylene. International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry, 40 (5), 401-410. (doi:10.1016/1359-0197(92)90202-Q).

Record type: Article

Abstract

A programme of experiments has been undertaken to examine transient charging/discharging currents and steady state currents in low-density polyethylene (LDPE) under the application of direct fields. This has been undertaken for pristine material and for material which has received doses of radiation between 104 and 106 Gy from either a 60Co γ-source or a research reactor. The material was irradiated in ambient air or dry nitrogen. Measurements were made for applied fields in the range 6.7 × 105-5.3 × 107 V m -1 and temperatures between ambient and 90°C. With pristine material at low fields, transient charging/discharging currents decreased monotonically with time. However, the mechanism changed at higher fields with a peak occurring in the charging transient indicating a space-charge limited process. Substantial charge injection was also in evidence as demonstrated by anomalous discharging currents. This transient response was echoed by the current/voltage characteristics of steady state behaviour. Gamma and neutron irradiation brought about a change in this situation and the charge transport mechanism altered gradually from space-charge-limited conduction to an ohmic process with increasing dose. The role played by charge traps appears to be significant.

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More information

Published date: November 1992
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 254023
URI: https://eprints.soton.ac.uk/id/eprint/254023
ISSN: 1359-0197
PURE UUID: 68f4c636-b9b0-43c9-b005-dd646df07d80

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Date deposited: 11 Oct 2000
Last modified: 14 Dec 2018 17:31

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Contributors

Author: H.M. Banford
Author: R.A. Fouracre
Author: G. Chen
Author: D.J. Tedford

University divisions

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