{"knowledge_schema": {"broad_category": "Physics \u2192 Materials Science \u2192 Electron Microscopy", "refinement": "This problem involves the detection limits of elements using Energy Dispersive X-ray Spectroscopy (EDX) with specific parameters such as electron beam energy and window thickness.", "specific_scope": "The focus is on identifying the lightest element that can be detected in a sample (pure tungsten) using a given EDX setup (30 keV electrons and a 100 \u00b5m thick Be window).", "goal": "Determine the lightest detectable element based on the provided EDX system parameters."}, "summary": "This problem pertains to the detection capabilities of an EDX system, which is influenced by the energy of the electrons used and the thickness of the window through which X-rays are detected. The task is to identify the lightest element that can be reliably detected in a pure tungsten sample under the specified conditions. Given the parameters, magnesium is determined to be the lightest element detectable, as it falls within the detection limits of the EDX system."}