A method to obtain high sensitivity and accuracy for nondestructive analysis of gold ore is proposed. The applied technique is energy-dispersive X-ray fluorescence, using a Co-57 radioisotope source to excite gold K X-rays in the sample, and a high-purity Ge (HPGe) detector with
a range of energies from 1 keV to 4 MeV. The use of radioisotope sources and K X-rays gives some advantages in comparison with other analytical techniques and the usual tube excitation L X-ray analysis: the high sensitivity to concentrations of 1 ppm, the absence of interferences
from other elements present in the matrix, and the possibility of performing fast and economical nondestructive analyses of large samples.
Departamento de Física Aplicada, Escuela de Minas, Universidad de León, 24004 León, Spain
Publication date: May 1, 1996
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