Combined Standard Uncertainty for Radiochemical Determinations
Quantitative determination of many radioactive analytes in environmental samples begins with sample preparation to solubilize the matrix, followed by series of separation and purification steps. Losses of the analyte associated with these steps can be monitored and corrected by use of one or more tracers. The calculation of the analyte activity concentration has to include all data gathered during the sample preparation, the separation and purification steps, and the final counting process. The final result has to be evaluated for its accuracy and precision, and the sources of uncertainties need to be determined and included. ISO guidelines can be used to standardize and simplify the process of calculating the combined standard uncertainty. An overview of the relevant concepts and equations as applied to calculations of radiochemical analytical results will be presented. The concepts of the uncertainty budget will be introduced.
This abstract was presented at the 32nd Annual Midyear Meeting, "Creation and Future Legacy of Stockpile Stewardship Isotope Production, Applications, and Consumption", Analytical Techniques Session, 1/24/1999 - 1/27/1999, held in Albuquerque, NM.