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Amarillo analyzed Bureau of Mines C. G. Kirkland carbon dioxide Catalytic conversion methods CH4 Ne N2 closed coil and trap coil-and-trap assemblies Cold Trap concentrated impurity sample Concentration Factor concentration ratio contained in conventional cylinder adapter valve cylinder valve DETERMINING TRACE IMPURITIES Exell FEMALE NPT freezeout trap gages are turned Gas Flow Diagram Grade-A helium H2 Ne N2 Helium Activity helium contained helium passed impurities in Grade-A inlet valve L. W. Brandt liquid helium liquid nitrogen Mass spectrometer analysis mass spectrometer methods micromanometer micron Mines Helium Navajo neon Number opened slightly Otis pass through valve percent deviation obtained PHeVHe Pirani gages PtVt PtVtHet purge purified helium leaving residual helium sample of Grade-A silver-brazed stainless steel tubing system is evacuated thermal conductivity total impurity content Total impurity p.p.m. trap assembly Trap Inlet Trap liquid trap valves V-point vacuum valve F volume of helium W. M. Deaton WALL SPEC wet-test meter