Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Gravimetric Preparation of Primary Standard Gas Mixtures in the Parts Per Trillion Range.

Authors
Loya-EW; Seitz-CA; Emerson-DE
Source
MISSING :4 pages
Link
NIOSHTIC No.
10006321
Abstract
A method for preparing gravimetric primary standards of helium in the parts per trillion range has been developed by the Bureau of Mines. The standards are used to calibrate a specially modified mass spectrometer used in determining the abundance of helium-3 and helium-4 in geochemical samples and of helium-3 in isotopically purified helium-4. The desired gas standards are prepared in 5-kg metal cylinders filled to 1,800 psia. Relative errors of less than 1 pct have been attained in the parts per trillion range using a successive dilution technique.
Publication Date
19820101
Document Type
IH; Report of Investigations
Fiscal Year
1982
NTIS Accession No.
NTIS Price
Identifying No.
RI 8643
NIOSH Division
HEFO;
Source Name
MISSING
TOP