An improved analyzer for determining helium-4 in parts-per-billion range
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.
 
 
i

Superseded

This Document Has Been Replaced By:

i

Retired

This Document Has Been Retired

i

Up-to-date Information

This is the latest update:

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:
  • File Type:
  • Supporting Files:
    No Additional Files
No Related Documents.

You May Also Like:

  1. Filetype[PDF - 737.93 KB]
    Personal Author:
    Sacks, H. Kenneth.
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1978
    Series:
    Report of investigations (United States. Bureau of Mines) ; 8302
    Report of investigations (United States. Bureau of Mines) ; 8308
    Description:
    "The Bureau of Mines has developed hardware for electromagnetic (EM) detection and location of miners trapped in underground coal mines. This report describes a technique for using the developed equipment for locating uncased boreholes underground. R...
    File Type:
    Filetype[PDF - 737.93 KB]
  2. Filetype[PDF - 1.80 MB]
    Personal Author:
    Anderson, Donna L.
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1990
    Series:
    Report of investigations (United States. Bureau of Mines) ; 9319
    Description:
    "This U.S. Bureau of Mines report discusses the status of a laser- based guidance system to provide position and heading feedback and closed-loop control of tramming maneuvers for a continuous mining machine. The system has been developed and tested ...
    File Type:
    Filetype[PDF - 1.80 MB]
  3. Filetype[PDF - 7.71 MB]
    Personal Author:
    Barton, T. M. (Timothy M.); Mark, Christopher;
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1989
    Series:
    Report of investigations (United States. Bureau of Mines) ; 9283
    Description:
    "The U.S. Bureau of Mines is conducting research to assess the effectiveness of different chain pillar designs in maintaining gate entry stability. A particular concern is ground control for deep- cover longwalls located at depths in excess of 1,000 ...
    File Type:
    Filetype[PDF - 7.71 MB]
  4. Filetype[PDF - 6.93 MB]
    Personal Author:
    Tolley, W. K. (William K.); Nichols, I. L. (Ivan L.); Huiatt, J. L.;
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1984
    Series:
    Report of investigations (United States. Bureau of Mines) ; 8882
    Description:
    "This report presents data collected during research by the Bureau of Mines on corrosion of grinding media. Corrosion rates of eight alloys commonly used in grinding media were tested in synthetic mill water using an ultrasonic grinding device especi...
    File Type:
    Filetype[PDF - 6.93 MB]
  5. Filetype[PDF - 909.32 KB]
    Personal Author:
    Kovscek, P. D. (Paul D.); Taylor, Charles D. (Charles Darrell), 1946-; Handewith, H. (Howard);
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1991
    Series:
    Report of investigations (United States. Bureau of Mines) ; 9374
    Description:
    "The performance of a novel prototype kerf-cutting impact mining machine was evaluated under a cooperative agreement between the U.S. Bureau of Mines and ramex systems, Bellevue, Washington, while operating under conditions typical of normal tunnel e...
    File Type:
    Filetype[PDF - 909.32 KB]