Accession Number:

ADA093106

Title:

Studies of the Interactions of Ionizing Radiations with Communications Materials.

Descriptive Note:

Interim rept. 1 Oct 78-30 Sep 80,

Corporate Author:

ROME AIR DEVELOPMENT CENTER GRIFFISS AFB NY

Personal Author(s):

Report Date:

1980-11-01

Pagination or Media Count:

63.0

Abstract:

This report summarizes experimental and theoretical studies designed to yield information on the interaction of ionizing radiations with various communications materials. The optical properties of Kapton have been measured over the energy range from 0.5 eV to 76 eV. Theoretical models combined with experimental optical data have been used to calculate mean excitation energies, mean free paths, and stopping powers for low-energy electrons 100 eV to 10 keV in various solid organic insulators. The contribution to both the mean free path and stopping power due to K-shell ionizations in carbon, nitrogen, and oxygen where then obtained from theoretical atomic generalized oscillator strengths and added to the valence electron contributions. A model involving the diffusion of excitons has been proposed to explain data, reported in the literature, showing that a thin metallic surface layer may partially protect organic crystals against radiation damage. The stopping powers of several metals for electrons have been calculated from an electron gas statistical model and used to calculate the continuous slowing-down-approximation range and range straggling for electrons with energies or 10 keV. Microdosimetric calculations have been made of the structure of heavy-ion tracks in silicon. Results show that these tracks are very small in lateral extent compared with the dimensions of critical volumes in currently used microelectronic components.

Subject Categories:

  • Plastics
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE