[en] The quality assurance program in a Nuclear Medicine Department pretends to minimize errors and artifacts that cover all aspects of clinical practice. The intrinsic flood-field uniformity is one of the quality control procedures to evaluate the response of a gamma camera to a spatially uniform flux of an incident gamma radiation over the field of view. The purpose of this study is to test our gamma cameras, by recording the obtained results of the integral and differential uniformity in order to generate a data base which is going to be our reference benchmark to evaluate the performance of the systems in the future. At the beginning we performed an evaluation of our acquisition protocol which implies the variation of the acquired counts, the energy window width and its placement. After that, we analyzed the recording data, creating plots which show the performance of the systems. As a result using an energy window placed at 140 keV at 20%, with matrix size of 512 x 512, acquiring 15 million counts and the source activity close to 700 μC; we obtained good images and both uniformities are within the manufacture's requirements, however, increasing the number of acquired counts, images are much better and an improvement in the evaluated parameters can be seen. The performance evaluation, of the three gamma cameras, was taken into account for approximately 240 days, showing an integral uniformity range of 1.04 - 3.5 % and the range for differential uniformity varies from 0.88 up to 2.7 %. We conclude that the gamma cameras were working well, we do not need to vary our acquisition protocol because it is good to evaluate these figures; also other factors affecting the quality of the images are radioactive waste material not very well shielded and temperature room variations, especially at the beginning of our workday. (author)