Title: Absolute Isotope Amount Ratio Measurements on Gases Part I: Measurements of Isotope Amount Ratios - Basic Theory
Authors: VARLAM MIHAIVALKIERS STAFBERGLUND MICHAELGONFIANTINI RobertoDE BIEVRE Paul
Citation: INTERNATIONAL JOURNAL OF MASS SPECTROMETRY vol. 269 p. 78-84
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2008
JRC Publication N°: JRC42226
ISSN: 1387-3806
URI: http://www.elsevier/locate/ijms
http://publications.jrc.ec.europa.eu/repository/handle/JRC42226
DOI: 10.1016/j.ijms.2007.09.020
Type: Articles in Journals
Abstract: A basic measurement model and corresponding measurement function for measuring isotope amount ratios on various gases is described and discussed. The approach is different from the one used in delta measurements not only by the method but also by the nature of the results. Performed on similar types of 'hardware' (a gas isotope ratio mass spectrometer) Isotope Amount Ratio Measurements ('IARM') are not intended to replace the traditional (delta) isotope measurements but to complement them: providing 'absolute' isotope amount ratio values when there is a need for them. The basic theory is discussed while in a subsequent paper, illustrations by experimental values will be described. The measurement functions used in performing 'IARM' describe a transparent and metrologically traceable relationship between an isotope amount ratio of an element (the quantity intended to be measured i.e. the 'measurand') to its measured ion current ratio (the quantity subject to measurement), based on the gas flow dynamics in the gas inlet system of the mass spectrometer and due consideration of isotope fractionation effects.
JRC Institute:Institute for Reference Materials and Measurements

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