[en] The use of radioisotopes of high specific activity is of great importance in studies on distributions of radioactive substances in living beings. In countries where only low thermal neutron flux reactors are available the production of ⁶⁴Cu of specific activity is carried out by the Szilard-Chalmers process, which involves the braking of the chemical bondings of the compounds. In this work, experiments were carried out by irradiating the compound bis-[N-benzoil-phenylhydroxylaminate] copper (II) in IEA-R₁ nuclear reactor in a thermal neutron flux of 5x10¹² n/cm². Samples without and with thermal treatment before and/or after irradiation were tested. Samples without pre-heating and with thermal annealing were irradiated for 6,5 h and yields of ⁶⁴Cu of about 3,900 MBq/mg Cu were obtained 21 h after the end of irradiation. The results in this work show the possibility of the preparation of ⁶⁴Cu of high specific activity with that compound by the Szilard-Chalmers process. The faseability of its production will depend on the optimization of the chemical processing and on the preparation of ⁶⁴Cu in a suited form for medical applications. (author)