Chemistry: physical processes – Physical processes – Crystallization
Patent
1973-09-13
1978-07-18
Marantz, Sidney
Chemistry: physical processes
Physical processes
Crystallization
23254R, 55386, 73 231, 751225, 148 203, 210 31C, 250381, 250384, G01N 3108
Patent
active
041012780
ABSTRACT:
An ionization detector, such as an electron capture detector for use in pesticide residue analysis, utilizes a scandium tritide beta particle source. The scandium tritide forms a surface portion of a metallic foil. If the foil initially exhibits an unacceptably high tritium emanation rate at desired high operating temperatures, e.g., at temperatures above 250.degree. C, the foil can be treated so as to exhibit an acceptable tritium emanation rate at such temperatures. The treatment comprises heating the foil at a predetermined treatment temperature, e.g., at a selected temperature in the 300.degree. to 400.degree. C range, until the tritium emanation rate for the foil at the selected treatment temperature reaches a value which correlates with an acceptable tritium emanation rate for the foil at a particular desired operating temperature.
REFERENCES:
patent: 3185845 (1965-06-01), Lively et al.
patent: 3601609 (1971-08-01), Yauger
patent: 3725009 (1973-04-01), Lovelock
Fenimore et al., Analytical Chem., v. 43, pp. 1972-1975 (1971).
Hartmann, Analytical Chem., v. 45, pp. 733-739 (1973).
Cole Stanley Z.
Fisher Gerald M.
Marantz Sidney
Morrissey John J.
Varian Associates Inc.
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