Study On Analysis Procedure Of U, Th, Ra, V, Fe, Ca, Mo And Completing Analysis Of Nuclear Grade Uranium In Order To Determine Ratio Of O /U Meeting ASTM Standard For Manufacturing UO2 From Uranium In Vietnam

We have carried out this project for analyzing contents of Uranium and Th, Ca, Fe, V, Mo in Uranium ore by using X-ray fluorescence spectrometry method. We have also researched parameters of X-ray generator such as Cu, Mo secondary fluorescence target, exciting high voltage, current X-ray tube, procedure for preparing samples, measuring time, detection limit. By using standard samples which have contents known in advance and calculating based on fundamental parameters, we can determine contents of U, Th, Ca, Fe, V, Mo in the samples accurately. Uranium and other radioactive nuclei in the solid and liquid waste have been determined by using Gamma spectrometry and ICP mass spectrometry method. The specific energy lines and procedure for preparing and storing samples have researched. After storing experimental samples for a month to attain equilibrium, we have measured them by using Gamma spectrometry Digidard-10 on Gamma vision software. Besides, we have carried out experiments to find out optimal parameters of conditions and time in vacuum heating for determining the ratio of O/U. Based on the received results, procedures for determining ratio of O/U have been set up according to ASTM standard. (author)