Description

1.1 This practice describes techniques for the determination of evaporated barium yield, getter gas content, and getter carbon monoxide sorption capacity for barium flash getters used in electron devices. Test conditions are chosen to approximate use conditions.

1.2 Auxiliary procedures for cleaning, for determining vacuum system leak-up rates, for flashing getters, and for determining barium content in both getter fill and films are also given.

1.3 The various tests described are destructive in nature. In general the tests are semiquantitative but they can be expected to yield comparative information on a single-laboratory basis to the precision indicated. No information relative to multilaboratory reproducibility is available.

1.4 List of Methods Described

Method	Section
Barium Content, Determination of,	9
Acid-Base Titration Method	9.6
Complexation (Titration) Method	9.7
Gravimetric Method	9.4
Photometric Method	9.5
Weight Difference Method	9.8
Barium Yield, Determination of,	10
Carbon Monoxide Sorption Characteristics, Determination of	12
Cleaning Procedures	6
Getter Mount	6.3
Getter Test Bulb	6.4
Flashing Procedures	8
Gas Content, Determination of for Doped Getters:	11
Hydrogen	11.7
Nitrogen for Undoped Getters:	11.8
Preflash Gas Content	11.5
Total Gas Content	11.4
Leak-Up Rates, Determination of	7

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements are given in Section 4.