APPLICATION OF THE STANDARDIZATION KO-INAA METHOD TO DETERMINE CONCENTRATIONS OF THE ELEMENTS SM AND LA IN THE AIRBORNE SAMPLES WITH CORRECTION OF THE TRUE COINCIDENCES

Abstract

Concentrations of the elements Sm, La in the airborne samples was determined by Cao Dong Vu [1] but it hasn't dealt with the true-coincidences effects. According to authors [2], the rare earth elements have low energy gamma rays after irraditation of the neutron. Because of electron capture or internal conversion, the coincidence between gamma rays with X rays lead to lossing of the counts (summing-out) or increase of the counts (summing in). In this paper, we apply of the standardization Ko-INAA to determine concentrations of the elements Sm and La in the airborne samples with correction of the true-coincidences. As the result, the concentration of La was between 1.37 ug/g and 6.12 ug/g, the concentration of Sm was between 0.20 ug/g and 0.34 ug/g. This result is very accuracy. This clearly shows when comparing with the analysis on concentration of Sm in standar sample namely Coal Fly Ash (NIST-1632c).