The comparison of diffraction patterns to “comparison data” was changed to comparison to “reference data”.Qualitative Phase Analysis (Identification of Phases).Silicon powder or α-alumina (corundum) were added as examples of certified reference materials.The cobalt description as most used anode for organic substances was deleted. Silver was also added as a utilized principal radiation source. In the X-Ray radiation sub-section, the definition of polychromatic radiation as “Bremsstrahlung or white radiation” was added.The revision also added hybrid photon counting detectors as more common detectors. It was further clarified that the receiving slit is used only when a 0D detector is present. In the second paragraph the term “parallel collimator” was replaced with the term “Soller slit,” which is a better representation of the component.Minor editorial changes were done in the first paragraph of Instrument set-up sub-section for clarification.Minor editorial changes were done in the last paragraph.Figure 2 was replaced with a better-quality figure.Additional minor editorial changes were done. Deleted “crystallinity” and added “microabsorption” for the factors that affect the intensity in the third paragraph.The second paragraph was clarified to indicate that the discussion is for a polycrystalline powder.In the first paragraph the phrase “scattered X-rays” was changed to “elastically scattered X-rays”.In the first paragraph the term “crystallite” is clarified, and the particle orientation was replaced with preferred orientation.In the beginning of the monograph, added the statement: “Portions of this monograph that are national USP text, and are not part of the harmonized text, are marked with symbols symbol to specify this fact.The changes from the current version of the chapter are: The chapter has been formally approved by the General Chapters–Physical Analysis Expert Committee in accordance with the Rules and Procedures of the Council of Experts. The revision to the harmonized standard for 〈941〉 Characterization of Crystalline and Partially crystalline Solids by X-Ray Powder Diffraction (XRPD) has been approved by the Pharmacopeial Discussion Group (PDG) as described in its PDG Stage 4 sign-off cover sheet. Type of Posting: Notice of Adoption of Harmonized StandardĮxpert Committee: General Chapters–Physical Analysis (GCPA)Ĭoordinating Pharmacopeia: European Pharmacopeia
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