2. Standards
Standards, whether in solid or gaseous form, are reference standards whose concentrations and isotopic composition in rare gases are perfectly known. Connected to a UHV purification line, they are used to determine the sensitivity of mass spectrometers for each of the isotopes analyzed, which is usually expressed in amperes per torr and represents the analyzer's ability to detect a known quantity of gas. Its value, between 10 –5 and 10 –3 A · – torr 1 depending on the source parameters, is essential for calculating gas concentrations in a sample.
Measuring isotope ratios in a standard allows us to evaluate fractionations, whether instrumental in the analyzers or natural in the rocks analyzed....
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Unit operations. Chemical reaction engineering
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Standards
Presentation of a purification cabinet
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)
Hiroshima University
NOAA, Oregon United States...
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