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- Uranium reserves 1
- uranium reserves 4
- urânio 4
- urânio 235 1
- urânio ligeiramente enriquecido 1
- Uriel Costa Ribeiro 8
- urine 2
- USA 1
- uses 12
- USGS 1
- Usina Piloto 1
- Usinas nucleares 1
- Usinas piloto 2
- usinas piloto 4
- usos 1
- UV dosimeter 1
- vaccines 3
- vacuum melting 1
- validation 2
- Vanderley Vasconcelos 1