Uranium and thorium analysis in tin slag by EDXRF using the standard addition method

The paper looks into the possibility of using standard addition method to analyse uranium and thorium in tin slag. Tin slag samples obtained from Butterworth was grind to 180 μm and injected with different concentrations of uranium and thorium. Linear calibration graphs were obtained for both these samples with R2 values for uranium and thorium as 0.9989 and 0.9915 respectively. Based on this graphs, the initial uranium and thorium in the tin slag sample was established as 60 ppm for uranium and 160 ppm for thorium. (Author)