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Mass Spectrometer Method for Determining Parts Per billion Helium-3 in Helium.
NTIS: PB 252 474 :10 pages
The Bureau of Mines has developed a mass spectrometer method for determining the helium-3 content of high-purity helium. The work was performed to evaluate experimental methods for removing helium-3 from high-purity helium and to better determine the composition of pure helium used in research. This was accomplished by increasing the inlet sample pressure, ionizing current, and amplification of the current produced by the ions collected on a conventional mass spectrometer that had been modified. With these modifications, the helium-3 content was determined in the parts-per-million and parts- per-billion range in helium-4.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 252 474
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division