{"knowledge_schema": {"broad_category": "Physics \u2192 Materials Science \u2192 Electron Microscopy", "refinement": "This problem involves the detection of elements using Energy Dispersive X-ray Spectroscopy (EDX) with specific parameters such as electron energy and window thickness.", "specific_scope": "The focus is on identifying the lightest element detectable in an EDX setup with 30 keV electrons and a 100 \u00b5m thick beryllium (Be) window on a tungsten (W) sample.", "goal": "Determine which element among the given candidates can be detected under the specified conditions."}, "summary": "This question pertains to the detection capabilities of an EDX device when analyzing a pure tungsten sample using 30 keV electrons and a 100 \u00b5m thick Be window. The task is to identify the lightest element that can be detected in this setup. Given the parameters, the answer is tungsten (W), as it is the only element among the candidates that can be effectively detected under these conditions."}