TRANSIENT CONDUCTIVITY IN ORGANIC INSULATORS
Abstract
A technique for measuring quasi-dc photoconductance in amorphous polymers during steady-state irradiation was developed. This technique, which involves control of the sample's history prior to making measurements, was applied to 21 polyethylene and 14 polystyrene samples, during exposure to Co60 gamma fields with intensities up to 200000 r/hr. Conductances observed using this technique were inversely proportional to sample thickness, thus permitting calculation of the bulk, quasi-dc photoconductivities. Analyses of the data from the observations indicate the following: that both these materials are essentially ohmic, at least up to applied electric fields on the order of 10% of breakdown; that trace impurities do not play important roles in the conduction mechanisms involved in either material; that structural defects may play such a role, but if they do, they are present in very large concentrations-in polyethylene at least so large they are considered essential structural features; and that in both materials, dependence on radiation intensity is weaker than reported.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1967
- Accession Number
- AD0660820
Entities
People
- John W. Winslow