Uncertainty calculation in gamma spectrometric measurements of environmental and foodstuffs samples

In this paper a comparative study, among different methodologies for expanded uncertainty calculation, is presented. The study was done for gamma spectrometric assay of environmental and foodstuffs samples. The compared methodologies were the software methods of gamma spectra analysis used in our Laboratory, the calculation through partial derivates generation and the Kragten spreadsheet technique. As conclusion, in our specific measurement conditions, there were not found significant differences among the compared methodologies