{"thcode":2,"term":{"code":1337,"name":"x-ray diffraction","parent":153,"scope":"Study of crystals which uses short wave electromagnetic radiations (x-rays). The xrays, scattered by the crystal atoms, show a characteristic interference pattern that is dependent upon the structure of the crystal."},"uf":[],"bt":[{"code":153,"name":"chemical analysis","parent":619,"scope":"Chemical techniques used to identify the composition of substances."},{"code":619,"name":"laboratory methods","parent":734,"scope":"Techniques to analyze and test samples in a place equipped and designed for the work."},{"code":734,"name":"methods","parent":1,"scope":"Techniques, methods, procedures, or strategies for research, management, collection, or analysis of scientific information in USGS."},{"code":1,"name":"Categories","parent":null,"scope":"Thematic terms for categorizing information resources.  This thesaurus is intended to support finding and understanding scientific information."}],"nt":[],"rt":[{"code":747,"name":"mineralogy","parent":464,"scope":"Branch of earth sciences concerned with the study of naturally occurring inorganic elements or compounds."}]}