[en] Several Costa Rican state institutions are interested in implementing a research project on the prospects for uranium and other radioactive elements in the national territory. Assistance for this project has already been requested from the United Nations Development Programme (UNDP) Special Fund in view of the presence in Costa Rica of acidic igneous rocks (intrusive and extrusive) and associated sedimentary and volcanic rocks of differing lithological character ranging in age from the Jurassic - Cretaceous to the Upper Tertiary - Quaternary, which are similar in part to the igneous and sedimentary rocks from the Precambrian to the Lower Phanerozoic in North America, containing abundant known deposits of uranium of low recovery cost. It is hoped to achieve the following objectives: (1) to select some areas that are geologically favourable for the existence of uranium horizons; (2) to select the analytical and exploration techniques; (3) to determine the radiation and content of uranium and any other radioactive elements in the rocks occurring in the selected areas, and (4) to prepare a report on the results and to define future studies. (author)