Accession Number:

AD0840562

Title:

RADIATION EFFECTS IN DIELECTRIC MATERIALS.

Descriptive Note:

Quarterly rept. no. 6, 16 Jan-15 Apr 68,

Corporate Author:

GULF GENERAL ATOMIC CO SAN DIEGO CA

Report Date:

1968-09-01

Pagination or Media Count:

50.0

Abstract:

A model that explains observed polarization effects in insulators is proposed. A set of nonlinear partial differential equations applying to this model is given this cannot in general be solved in closed form but may prove amenable to computer solution. The results of some sapphire irradiation experiments are presented showing the effect on polarization of different surface contact treatments. The results of conductivity measurements on different samples of sapphire show radiation-induced conductivity in Czochralski-grown single crystals to be approximately 2.5 times that in Verneuile-grown crystals. Also, results of proton-irradiation experiments on Mylar are presented and their applicability as a test of the van Lint-Nichols theory of ionization effects in irradiated dielectrics is discussed. A new formulation for the radiation-induced conductivity in insulators is presented which predicts a linear dependence on dose rate. Radiation experiments on polyethylene capacitor structures show a linear dependence of the prompt conductivity on dose rate over three orders of magnitude and show no dose dependence effect for a wide range of radiation pulse widths. Author

Subject Categories:

  • Miscellaneous Materials
  • Radioactivity, Radioactive Wastes and Fission Products

Distribution Statement:

APPROVED FOR PUBLIC RELEASE