NASA NTRS · 19660000437
Densitometer system for liquid hydrogen has high accuracy, fast response
Abstract
Developmental densitometer system for cryogenic liquids uses two balanced ionization chambers containing xenon gas, with X rays as the radiation source. The X rays are heavily filtered with a lead shield to make the energy spectrum much less dependent on the voltage applied to the X ray tube.
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1966-10-01. Densitometer system for liquid hydrogen has high accuracy, fast response. https://ntrs.nasa.gov/citations/19660000437
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