The procedure has been explained to evaluate the equipment performance by repeated measurements of energy dispersive X-ray fluorescence signal of 4.201  104 mol L1 uranium solution in 3 mol L1 of HNO3. Standard statistical models were applied to the data. The Poisson distribution function [F(X)P] and Normal distribution function [F(X)N] were found to be 1.0197 and 1.0049 respectively, which are quite near to the ideal value of unity. Linearity range for uranium determination by XRF was found to be up to 1.47  102 mol L1 of uranium, with regression coefficient “R2” of 0.998 under the optimized instrumental parameters.

Riaz Qadeer and Nasir Khalid