An Improved Method and Apparatus for Analysis of Impurities in Helium.
Emerson-DE; Hoffman-CA; Weems-GW
NTIS: PB 196 598 :10 pages
An improved method and apparatus for determining the impurities in helium by preconcentration and subsequent analysis by mass spectrometry are described. Proconcentration of the impurities is accomplished by passing a known volume of helium, at slightly above atmospheric pressure, through a metal coil and trap assembly immersed in liquid helium. The concentrated impurities are then analyzed by mass spectrometry. This method can detect impurities in the range of 0.01 to 600 ppm with an accuracy of better than +-0.05 Ppm at the 1-ppm level. One operator can analyze 15 samples in an 8- hour day.
IH; Report of Investigations
NTIS Accession No.
NTIS: PB 196 598