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An improved analyzer for determining helium-4 in parts-per-billion range
Filetype[PDF-538.52 KB]


Details:
  • Personal Author:
  • Corporate Authors:
    United States. Bureau of Mines.
  • Description:
    "The Bureau of Mines has modified its parts-per-billion helium-4 analyzer to improve the analytical capabilities of the instrument. The modifications resulted in the following improvements: (1) the analytical precision of the instrument for 10 consecutive analyses was improved to +/-1 ppb at the 5,000-ppb helium-4 level, (2) the helium-4 sensitivity was increased almost tenfold, and (3) the minimum detectable limit for helium-4 was improved to 0.5 Ppb. The modifications made to improve the instrument included replacing the ion-source control circuit with a direct-current solid-state design, controlling the temperature of the ion source, stabilizing and reducing the pumping rate of the vacuum system, and optimizing peak integration." - NIOSHTIC-2

    NIOSHTIC no. 10005040

  • Subject:
  • Document Type:
    Report
  • Collection(s):
    National Institute for Occupational Safety and Health
  • Main Document Checksum:
  • Supporting Files:
    No Additional Files
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