Accession Number : AD0816778

Title :   RADIATION EFFECTS IN DIELECTRIC MATERIALS.

Descriptive Note : Quarterly rept. no. 2, 1 Dec 66-28 Feb 67,

Corporate Author : GENERAL DYNAMICS SAN DIEGO CA GENERAL ATOMIC DIV

Personal Author(s) : Overmyer, R. F.

Report Date : JUL 1967

Pagination or Media Count : 21

Abstract : Three substrate materials, Pyrex, fused quartz, and sapphire, with thin-film-evaporated electrodes were irradiated in vacuum and air with high-energy electrons from a linear accelerator at 10 to the 8th and 9th powers rads (Cu)/sec. The major portion of the induced signals in the Pyrex and quartz samples was due to secondary-electron emission. Induced conductance in each of these samples was similar in magnitude. Induced conductance in the sapphire substrate was about thirty times larger than that of the Pyrex or quartz samples and exhibited a short delay component. The observed secondary-emission signals were smaller, as expected, than the generally used value of 5 x 10 th the minus 13th power coulomb/rad-sq cm because of the sample geometry employed to minimize the effects of replacement current. (Author)

Descriptors :   *ELECTRON IRRADIATION), (*DIELECTRIC FILMS, (*RADIATION EFFECTS, DIELECTRIC FILMS), SUBSTRATES, HEAT RESISTANT GLASS, QUARTZ, MELTING, SAPPHIRE, SECONDARY EMISSION, ELECTRON ACCELERATORS.

Subject Categories : Electrical and Electronic Equipment
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE