= Paul De Bièvre
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<Paul De Bièvre> was a researcher in <isotope ratio> measurements, <reference materials> and chemical metrology. His IUPAC Council biography records leadership in <isotope> <mass spectrometry> and isotope reference materials at the European Commission's nuclear-measurement laboratory, later the Institute for Reference Materials and Measurements.<Paul De Bièvre nomination biography for the 43rd IUPAC Council>[Professional Experience, group leadership and laboratory responsibilities.]{ref}
With <René Dybkær>, <Aleš Fajgelj> and <David Brynn Hibbert>, <Paul De Bièvre> prepared the2011 IUPAC report on <metrological traceability> of chemical measurement results. The report's stated aim is a consistent view of traceability's creation, meaning and role in chemical measurement.<Metrological traceability of measurement results in chemistry: Concepts and implementation by Paul De Bièvre and others>[Publisher byline and Abstract.]{ref}
An original isotope-counting example shows why a ratio must be specified. If a hypothetical two-isotope material contains80 units of isotope A and20 of isotope B, its ratio A/B is4, while the fraction A/(A+B) is0.8. Multiplying a sample's total amount by ten changes neither value. An instrument response ratio still requires a <measurement model> relating its signals to those isotope amounts; unequal response to the two isotopes can alter the observed ratio.
This connects isotope measurements with <reference material> characterization and <measurement calibration>. A precise signal ratio is useful only when its relation to the specified <measurand> and reference is established, with appropriate <measurement uncertainty>. <Paul De Bièvre>'s documented work joined those experimental and conceptual aspects.
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