Implication Of X-Ray Path, Region Of Interest, Tube Current And Voltage In Calibration Of X-Ray Fluorescence Instrument: A Case Study Of X-Supreme 8000

摘要

Abstract: This report unveils the measures taken to calibrate the newly installed x-ray fluorescence instrument (X-Supreme 8000) in Multi-User Science Research Laboratory, Ahmadu Bello University, Zaria. Precision and accuracy is dependent on appropriate method set up and suitable analyte conditions. The tube current was set to achieve 20% dead time for silicon drift detector (SDD). The tube voltage setting with at least twice line energy of elements aided method set up for spectrum scan from which region of interest (ROI) was utilized to check interferences and matrix effect. Air readily absorb low energy x-ray, thus the analysis chamber was evacuated with helium for low Z elements up to Niobium (Nb). Direct proportional relationships occur between concentration of analytes and detector count per seconds (cps). The standard error of mean of given and calculated concentration of standard reference materials (SRM) range between 0.001 ' 0.013wt%. A relatively low standard deviation and repeatability of results confirms good precision and accuracy of the instrument.