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In radionuclide metrology three weighing methods could be used for source preparation. The Pycnometer, Elimination and Modified Elimination methods should be compared to evaluate the compatibility in the deposited mass results, so increasing their reliability. In this work, a sequence of micro drop deposition weighing is presented which allows comparing the results by the same drop deposition. The results from each method were determined and their compatibility was checked. As a result, the three methods based on carefully weighing were found compatible and comply with the required threshold uncertainty. Furthermore, it was confirmed the results are traceable to mass the mass unit.

From a commercial supplier, three independent lots of an aqueous solution containing

The sum-peak method, an absolute measurement technique that uses coincidence counting and γ-ray spectrometry, was applied to activity standardization of

Methods to determine U, Th, and other constituent elements in mineral matrices through Instrumental Neutron Activation Analysis (INAA), have been widely utilized due to their capability to extract a large quantity of information from small samples. In the present work, an experimental methodology based on INAA associated to the cluster statistics technique was used to determine the uranium concentration and its correlation with other elements present in the mineral phosphorites from the northeast region of Brazil. Data for 22 elements including rare-earth elements are presented. A good correlation between uranium and rare-earth elements is observed. For the transition metals, correlation with uranium was not noted.