The key raw material for the project was uranium, which was used as fuel for the reactors, as feed that was transformed into plutonium, and, in its enriched form, in the atomic bomb itself.
O material principal para o proxecto foi o uranio, utilizado como combustible para os reactores nucleares, como fonte para a súa transformación en plutonio e, na súa forma enriquecida, na propia bomba atómica.