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A mass spectrometer method for determining helium in the parts-per- million to 10-percent range.

Authors
Holland-PW
Source
Amarillo, TX: U.S. Department of the Interior, Bureau of Mines, RI 9359, 1991 Jan; :1-15
Link
NIOSHTIC No.
10009096
Abstract
The U.S. Bureau of Mines has developed a mass spectrometer method for determining helium in the parts-per-million to 10-pct range to an accuracy of +/-1 pct. The method employs a mass spectrometer, an inlet system utilizing a chromatographic gas-sampling valve, and an activated coconut charcoal trap cooled with liquid nitrogen. Gravimetrically prepared standards of helium in nitrogen were used to demonstrate the linearity of the method over the concentration range of 10 ppm to 10.66 pct helium.
Keywords
Helium-isotopes; Mass-spectrometers; Numerical-analysis; Standards; Helium-4; Mass-spectroscopy; Chemical-analysis
Publication Date
19910101
Document Type
IH; Report of Investigations
Fiscal Year
1991
NTIS Accession No.
PB91-225110
NTIS Price
A03
Identifying No.
RI-9359
NIOSH Division
HEFO
Source Name
City, ST: U.S. Department of the Interior, Bureau of Mines, RI 9359
State
TX
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