EJ/T 684-2016 Portable Energy Dispersive X-ray Fluorescence Analyzer has been changed from EJ/T 633-1992 Tube Excitation Energy Dispersive X-ray Fluorescence Analyzer.
EJ/T 684-2016 Portable Energy Dispersive X-ray Fluorescence Analyzer has been changed from EJ/T 767-1993 X-ray fluorescence analyzer excited by radioactive sources.
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