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Primary Examiner: Schafer, Richard E.
Assistant Examiner:
Attorney: Cole; Stanley Z., Fisher; Gerald M., Morrissey; John J.

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Title: Metallic foil coated with scandium tritide for use as a beta particle source in an ionization detector at high temperatures and method of manufacture

Abstract: A metallic foil coated with scandium tritide is treated so as to manifest a legally acceptable tritium emanation rate at temperatures above 225.degree. C, thereby becoming usable as a beta particle emitter is ionization detectors such as electron capture detectors or the like operated at high temperatures. The treatment includes heating the foil for a length of time sufficient to cause the foil's tritium emanation ratio to reach a value which corresponds to a legally acceptable emanation ratio for the foil at selected operating temperatures above 225.degree. C.

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Inventors: Hartmann, Charles H. (Moraga, CA, US)

Application Number: 395498
Filing Date: 1973-09-10
Publication_date: 1976-12-14
Assignee: Varian Associates (Palo Alto, CA)
Primary Class(es): 252/644 148/527, 148/560, 420/900
Other Classes:
US Patent Ref:

3185845	May, 1965	Lively et al.	250/304.
3601609	Aug, 1971	Yauger	250/375.
3716491	Feb, 1973	Yannopoulos	75/122.

Other Refs: 1,164,398

Sep, 1969	UK.

Other References: Kahn, L. et al. The Emanation of Tritium from Two Electron-Capture Detectors. In J. of Gas Chrom. Aug., 1965, pp. 287-288.
Shoemake, G. R. et al, The Effect of Temperature and Carrier Gas on the Loss Rate of Tritium from Radioactive Foils, In J. of Chrom. vol. 12 pp. 314-320 (1963).