ISO 15647:2004 specifies a method of isotopic analysis of uranium hexafluoride (UF6) with 235U concentrations less than or equal to 5 % by mass and 234U and 236U concentration between 0,001 % by mass and 1,5 % by mass. The method is in routine use to determine conformance to UF6 specifications.
ISO 15647:2004 is applicable if the mass spectrometer uses Faraday cups.