Portal de Periódicos da CAPES

Accuracy and precision in thick-target PIXE-PIGE analysis determined with geological standards

1984; Elsevier BV; Volume: 3; Issue: 1-3 Linguagem: Inglês

10.1016/0168-583x(84)90364-1

1872-9584

Lars-Eric Carlsson,

Advanced X-ray and CT Imaging

Simultaneous X-ray (PIXE) and gamma-ray (PIGE) analyses have been performed on international geological standards. Elements with atomic numbers 3, 5, 9, 11, 12 and 13 were determined from gamma-ray analysis and all heavier elements from X-ray analysis. To study the precision and accuracy attainable, one pellet for each of five international standards and one quartz standard were made. Each sample was analysed 10 to 19 times during a 6-month period. The results were used for calibration in such a way that apparent thin-target sensitivities were established to give correct values after matrix corrections with the fundamental parameter technique. The mean of the precision, expressed as one standard deviation, was 1.6% for elements with good pulse statistics. Ten duplicate pellets of a standard, made and thoroughly calibrated at the Department of Geology, Lund University, were analysed and the deviations from reference values for the elements Na, Al, Si, K, Ca, Fe, Rb and Sr were all less than 3.3%.