Accession Number : AD0282939

Title :   STUDIES OF PRIMARY ELECTRON SOURCES

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : ANDERSON,D.E.

Report Date : MAY 1962

Pagination or Media Count : 1

Abstract : Results from a controlled chemical activation tube are presented which lend support to the postulate that the thermionic emission from oxide cathodes is proportional to the Sr evolution rate to the one-half power. An oxide coating adherence problem has been encountered which will temporarily suspend radioactive tracer work until a new radioactive nitrate is obtained. A new technique for measuring emission from oxide cathodes during long-pulse and dc conditions is described. Further data on the photoelectric yield and pulse emission of a BaO cathode, obtained by converting BaCO3, are presented. The effects of poisoning this cathode by exposure to a dirty anode and subsequent recovery is illustrated. Photoelectric yield and pulse emission measurements from a thin film BaO coating indicate a relationship between these measurements. (Author)

Descriptors :   *CATHODES (ELECTRON TUBES), *THERMIONIC EMISSION, ALUMINUM, ANODES, BARIUM COMPOUNDS, CARBONATES, CATHODES, INSULATION, MATERIALS, NITRATES, OPTICAL ANALYSIS, OXIDES, PHOTOELECTRIC EFFECT, RADIOACTIVE ISOTOPES, SANDWICH PANELS, STRONTIUM, SUPERCONDUCTIVITY, SUPERCONDUCTORS, TANTALUM, TANTALUM COMPOUNDS, TEMPERATURE, THEORY

Distribution Statement : APPROVED FOR PUBLIC RELEASE