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Therefore, the accuracy of the liquid particle counter has to be established through calibration. According to ISO 11171 for the primary particle-sizing calibration NIST SRM 2806 suspension [clarification needed] has to be used. In annex "F" of ISO 11171, preparation of secondary calibration suspension is described.
Homogenization can have adverse effects, for example on proteins, so producers must take care not to over-process materials. [9] [17] Stability of a certified reference material is also important, so a range of strategies may be used to prepare a reference material that is more stable than the natural material it is prepared from.
The δ values and absolute isotope ratios of common reference materials are summarized in Table 1 and described in more detail below. Alternative values for the absolute isotopic ratios of reference materials, differing only modestly from those in Table 1, are presented in Table 2.5 of Sharp (2007) [1] (a text freely available online), as well as Table 1 of the 1993 IAEA report on isotopic ...
Since 1989, the director of NIST has been a Presidential appointee and is confirmed by the United States Senate, [45] and since that year the average tenure of NIST directors has fallen from 11 years to 2 years in duration. Since the 2011 reorganization of NIST, the director also holds the title of Under Secretary of Commerce for Standards and ...
Although a given calibrated microphone will often have been calibrated by other (secondary) methods, all can be traced (through a process of dissemination) back to a microphone calibrated using the reciprocity method at a National Measurement Institute. Reciprocity calibration is a specialist process, and because it forms the basis of the ...
The New York City Police Department released these images of “a person of interest” in the killing of UnitedHealthcare CEO Brian Thompson.
ISO/IEC 17025 General requirements for the competence of testing and calibration laboratories is the main standard used by testing and calibration laboratories. In most countries, ISO/IEC 17025 is the standard for which most labs must hold accreditation in order to be deemed technically competent.
Red meat may have its critics. But don’t forget that beef is also a source of many important nutrients, especially iron (nearly 2 g per 3-ounce serving of sirloin steak). While iron is most ...
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