Thermionic aluminosilicate sources of Tl{sup +} ions
Journal Article
·
· Review of Scientific Instruments
- National University of Singapore, Department of Physics, Faculty of Science, Lower Kent Ridge Road, Singapore 0511 (Singapore)
Thermionic filament sources of Tl{sup +} ions were made using tungsten wire coated with synthetic thallium aluminosilicates in the {beta}-eucryptite (Tl{sub 2}OAl{sub 2}O{sub 3}2SiO{sub 2}) and two other compositions (2Tl{sub 2}OAl{sub 2}O{sub 3}2SiO{sub 2} and 2Tl{sub 2}OAl{sub 2}O{sub 3}4SiO{sub 2}). Three different methods for the production of aluminosilicate melts were used. The performance characteristics as thermionic emission sources of Tl{sup +} ions based on total emission current and purity of ion emission as functions of time and filament surface temperature were studied and compared. Our results indicated that the sample of composition ratio of 2Tl{sub 2}OAl{sub 2}O{sub 3}2SiO{sub 2}, which was produced by resistance heating under atmospheric pressure in air, is an optimum Tl{sup +} ion source at temperatures between 1150 and 1350 {degree}C after 150 h of continuous heating. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
- OSTI ID:
- 165806
- Journal Information:
- Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 11 Vol. 66; ISSN 0034-6748; ISSN RSINAK
- Country of Publication:
- United States
- Language:
- English
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