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Standards Development
This International Standard defines terms for surface chemical analysis. Part four covers the terms related to the technique of total reflection x-ray fluorescence, extending the standard. ISO 18115-1 covers general terms and those used in spectroscopy, ISO 18115-2 terms used in scanning-probe microscopy and 18115-3 focuses on optical interface analysis including ellipsometry, Raman and nonlinear optical techniques.
TXRF is a surface sensitive, micro-analytical technique whose measurements typically take a few hundred seconds, and, depending on the analysis needs, limited sample treatment and only a few micrograms or microliters of sample. Simultaneous multi-elemental characterisation is rapid enabling qualitative information to be generated routinely. Quantitative analysis requires a more carefully considered experiment but can yield detection limits down to the ultra-trace elemental range. The easeof-use along with access to dedicated commercial instruments means that TXRF is a technique that can be employed by a broad range of people from very different backgrounds and from diverse fields for very different surface chemical analysis. Those conducting TXRF can be materials scientists, chemists, physicists, or biologists with those making use of the data and results extending beyond this group into other disciplines. The wide range of disciplines, expertise, skill level and the individualities of national users have led to divergence of meanings being attributed to specific terms and, again, different terms being used to describe the same concept, approach, or analysis. To avoid the consequent misunderstandings between communities and to facilitate the clear exchange of information, it is essential to clarify the concepts needed when undertaking a TXRF surface chemical analysis. This is motivated further by the need for correct reporting of metadata with the move to open access and FAIR data repositories. Thus, it is critical that the correct usage of terms relating to all aspects of a TXRF experiment are established in one place, and this is the purpose and justification for this standard. (Please use this field or attach an annex)
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