Thorium-containing effective cathodes

Author

Djubua, B.Ch. ; Polivnikova, O.V.

Author_Institution

SRPC Istok, Fryazino, Russia

fYear

2000

fDate

2000

Firstpage

88

Lastpage

91

Abstract

The authors have described the technological methods of fabrication of cathodes based on the following materials: W-Th, W-ThO ₂, W-ThO₂-C and Re-Th. Their thermionic and secondary-electron emission, as well as the evaporation speed of thorium, have been studied. The dependence of the radioactivity of the cathodes impregnated with thorium on their storage time has been investigated. It has been found that in the process of impregnation of a tungsten sponge at 2000°C practically all isotopes of thorium settle down on the cold walls of the vacuum oven and the isotope of Th²³² which possesses low radioactivity penetrates into the sponge. The cathodes radioactivity increases substantially in 1.5-2 months of their storing after the impregnation

Keywords

composite materials; magnetrons; mixtures; radioactivity; rhenium alloys; secondary electron emission; thermionic cathodes; thorium alloys; thorium compounds; tungsten alloys; 1.5 to 2 month; 2000 C; Re-Th; Th isotopes; Th-containing cathodes; Th²³² isotope; ThO₂; W sponge; W-Th; W-ThO₂; W-ThO₂-C; cathode fabrication; evaporation speed; impregnation process; radioactivity; secondary-electron emission; thermionic emission; Cathodes; Electron emission; Fabrication; Insulators; Powders; Pressing; Radio control; Steel; Temperature control; Tungsten;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave and Millimeter Wave Technology, 2000, 2nd International Conference on. ICMMT 2000

Conference_Location

Beijing

Print_ISBN

0-7803-5743-4

Type

conf

DOI

10.1109/ICMMT.2000.895627

Filename

895627