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- Method of analysis of impurities in helium in the parts-per-billion range
- An improved method and apparatus for analysis of impurities in helium
- Mass spectrometer method for determining parts per billion helium-3 in helium
- A method for determining helium in water
- Gravimetric preparation of primary standard gas mixtures in the parts per trillion range
- Analysis for impurities in helium using the helium ionization detector
- A method for the calibration of class 2 and class 4 standards of mass