An improved analyzer for determining helium-4 in parts-per-billion range

Details

• Personal Author:
  Holland, Philip W. ; Seitz, Charles A.
• 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
  
  
• Subjects:
  Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  7 numbered pages
• NIOSHTIC Number:
  nn:10005040
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:3e4157909dbf1f8d616e9128fedae1a6715603849f71d544e9775031116ea4977ffcd194670d1f691373680443597206b0d6b9055664b80714aa7ff4b9963b47
• Download URL:
  https://stacks.cdc.gov/view/cdc/10306/cdc_10306_DS1.pdf
• File Type:
  [PDF - 538.52 KB ]