5. Mistakes to avoid
5.1 Don't confuse an MRE with an MRC
MRC producers indicate on their certificates, with a few exceptions, that an MRC does not have to be used every day, for example to build a control chart. On the other hand, if the calibration of an X-ray fluorescence spectrometer has to be carried out using reference materials, then these are solid, very stable, long-lasting materials, such as rocks, which can be used regularly.
But as soon as we enter the realm of fragile or biodegradable measurands, this approach is totally unsuitable.
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Mistakes to avoid
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Bibliography
ISO Guide 33: Reference materials – Good practice in the use of reference materials, ISO, Geneva
ISO Guide 35: 2006: Reference materials – General principles and statistics for certification, ISO, Geneva
European co-operation for Accreditation , Doc EA-4/14 INF :2003 : The Selection and Use of Reference Materials
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