Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1984-07-30
1985-08-13
Levy, Stewart J.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
250288, G01M 300, B01D 5944
Patent
active
045342040
ABSTRACT:
A process of calibrating an ultrasensitive noble gas leak detector using a radioactive alpha source, such as americium 241, comprising accumulating helium molecules from the radioactive alpha source in an enclosed volume for a specified period of time, permitting the helium molecules to enter a vacuum chamber, and obtaining a gas detection measurement to calibrate the detector for the sensitivity of the system.
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Rosai, L. et al., Purification of Rare Gases and the Measurements of Residual Impurity Levels, J. Vac. Sci. Tech., vol. 11, No. 1, pp. 347-349, Jan./Feb. 1974.
Levy Stewart J.
Martin Marietta Corporation
Roskos Joseph W.
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