Method and system for analysis of a gaseous fluid containing at least a noble gas using a getter

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The method involves extracting rare gas from a gaseous fluid (1) by the passage of the gaseous fluid into a getterizing substrate (5) of an accumulation chamber, where the substrate is suitable for trapping the components of the gaseous fluid except for the rare gas. The extracted rare gas is compressed such that the pressure and the volume of the compressed rare gas are adapted to the pressure and the volume of the analysis, and the compressed rare gas is analyzed, where the rare gas is analyzed by a gaseous phase chromatograph (9) coupled with mass spectrometry. An independent claim is also included for a system for analyzing a gaseous fluid having a rare gas.