Abstract
A method for the determination of major and trace elements in some minerals (orpiment, realgar, lorandite, dolomite and markasite) from the Allchar mine, Republic of Macedonia, based on k 0 -instrumental neutron activation analysis (k 0 -INAA) is presented. The concentration of U and Th in all investigated minerals was found to be 50%), especially in realgar and orpiment, due to the high background produced by 76 As activity after irradiation by thermal neutrons, makes the determination of short-lived radionuclides present at micro levels by k 0-INAA impossible. To increase the accuracy of the determination and to enlarge the number of elements measured, arsenic should be separated from the samples.
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