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Non-destructive testing. X-ray diffraction from polycrystalline and amorphous materials - Instruments PAS 15 This document provides guidance for1 Scope This document sets out the characteristics of instruments used for X ray powder diffraction ("powder" as defined in EN 13925 1: 2003, Clause 5) as a basis for their control and hence quality assurance of the measurements made by this technique. Performance testing indicators are given for diffractometer performance testing. Different types and makes of X ray powder diffractometer vary considerably in their design and intended fields of