Evaluation of uncertainty for determination of trace thorium in U_3O_8 by isotope dilution inductively coupled plasma mass spectrometry

Taking determination of trace thorium in U3O8 by isotope dilution inductively coupled plasma mass spectrometry(ID-ICP-MS) as example,the uncertainty in measurement was evaluated.All parameters needed for the calculation process were collected and calculated,and a mathematical model was set up.The sources of the uncertainty in measurement were determined,and components of the uncertainty in measurement were synthetized with EXCEL software.