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4. Conclusion
This article describes in detail the technical characteristics of the chambers (design, choice of materials and equipment, vacuum technology, etc.) to achieve a vacuum quality compatible with the analytical requirements necessary for the purification and separation, under ultra-high vacuum, of noble gases extracted from geological samples.
Future improvements in purification methods are likely to be linked to technological advances in laboratory equipment, in particular :
the surface quality of materials, which could be improved by new treatment procedures (chemical, mechanical, thermal, etc.) to reduce adsorption and/or outgassing of gaseous species in ultra-high vacuum chambers;
turbomolecular pumping units by, for example, improving the gas compression ratio to reduce the gas flow...
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Unit operations. Chemical reaction engineering
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Conclusion
Glossary
Bibliography
Events
DINGUE (Development In Noble Gas Understanding and Expertise ). Workshop organized each year in conjunction with the GOLDSCHIMDT conference.
Standards and norms
- CF flange connection elements: The elements are made of 316L stainless steel [(DIN 17 440) – WN 14 404) Z2CND 17-12]. - « Pneurop » 6601/1981 et DIN 28 403 -
- Cuivre OFHC (Oxygen Free High Conductivity) : Cuivre élaboré suivant une méthode américaine. Son équivalent français est le cuivre Cu-c1 ou 2. - ISO 431 -
- Méthode gravamétrique de préparation des mélanges gazeux dans une bouteille à des fins d'étalonnage...
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Determination of the R/R a ratio of the He standard of Japan
Osaka University
Laboratory for Earthquake Chemistry (University of Tokyo)
Earthquake Research Institute (University of Tokyo)
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NOAA, Oregon United States...
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