ANTONIO ALVES DE FREITAS
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Artigo IPEN-doc 23509 Decommissioning of uranium pilot plants at IPEN-CNEN/SP: facilities dismantling, decontamination and reuse as new laboratories for strategic programs2016 - LAINETTI, PAULO E. de O.; FREITAS, ANTONIO A. de; VASQUES, FRANCISCO M.F.; FERREIRA, ROBSON de J.; COTRIM, MARYCEL E.B.; PIRES, MARIA A.F.From beginning of 90’s, the Brazilian nuclear policy has been changed radically. This determined the interruption of most R&D fuel cycle activities and the facilities shutdown at Nuclear and Energetic Research Institute (IPEN). The existence of those facilities also implicated in the need of constant surveillance, representing additional obligations, costs and problems. The reasons to promote the dismantling of the IPEN’s Nuclear Fuel Cycle Pilot Plants elapsed mainly from the need of physical space for new activities, since the R&D in the nuclear fuel cycle area were interrupted. In the last decade, IPEN has changed its “nuclear profile” to a “comprehensive and multidisciplinary profile”. With the end of most nuclear fuel cycle activities, the former facilities were distributed in four different centers. Each center has adopted a different strategy and priority to face the D&D problem. The available resources depend on the specific program in each area’s development (resources available from other sources, not only from Brazilian National Nuclear Energy Commission (CNEN). One of those new activities is the IPEN’s Environmental Program. This paper describes the procedures, problems faced and results related to the reintegration of the former pilot plant areas as new laboratories of the Chemical and Environmental Technology CenterCQMA of the IPEN.Capítulo IPEN-doc 22010 Status report on thechnical progress for LEU-based sup(99)Mo production at IPEN-CNEN/SP, Brazil - Modified Cintichem process2015 - OSSO JUNIOR, J.A.; DIAS, C.R.B.R.; TEODORO, R.; CATANOSO, M.F.; BRAMBILLA, T.P.; POZZO, L.; SQUAIR, P.; FUKUMORI, N.; CARVALHO, F.M.S.; ZINI, J.; CAMILO, R.L.; FORBICINI, C.; YAMAMURA, M.; ARAUJO, I.C.; FREITAS, A.A.; CARVALHO, E.U.; DURAZZO, M.; SILVA, A.M.; PIRES, M.A.; MARUMO, J.T.; DELLAMANO, J.C.; MENGATTI, J.; PERROTTA, J.A.Artigo IPEN-doc 20546 Review of brazilian activities related to the thorium fuel cycle and production of thorium compounds at IPEN-CNEN/SP2014 - LAINETTI, PAULO E. de O.; FREITAS, ANTONIO A. de; MINDRISZ, ANA C.Capítulo IPEN-doc 13901 Decommissioning of nuclear fuel cycle facilities in the IPEN-CNEN/SP2008 - LAINETTI, P.E. de O.; FREITAS, A.A. de; MINDRISZ, A.C.; CAMILO, R.L.Artigo IPEN-doc 16136 Studies on the separation of 99Mo from nitric acid medium by alumina2010 - YAMAURA, M.; FREITAS, A.A.; YAMAMURA, A.P.G.; TANAKA, R.M.N.; FORBICINI, C.A.L.G. de O.; CAMILO, R.L.; ARAUJO, I.C.99mTc, the product of radioactive decay of 99Mo, is one of the most used radioisotopes in nuclear medicine. The 99Mo is produced mainly by fission of 235U targets HEU or LEU. After the dissolution of uranium targets, chemical process for the separation and purification is performed in chromatographic columns. This work presents a study on the behavior of 99Mo removal by adsorption on acid and neutral alumina from nitric acid, which is the dissolution reagent for LEU targets in the Modified Cintichem Process. Adsorption kinetics in solution of HNO3 and the influence of pH were investigated. It was also evaluated the adsorption of 99Mo from nitric solutions containing uranyl ions.Artigo IPEN-doc 10778 Estudo do tratamento de um residuo de torio e terras raras por cromatografia de extracao2005 - ZINI, J.; ABRAO, A.; CARVALHO, F.M.S.; FREITAS, A.A.; SCAPIN, M.A.Artigo IPEN-doc 08841 Transformacao via peroxido de um hidroxido bruto de torio em nitrato para camisas de lampiao2002 - FREITAS, A.A.; CARVALHO, F.M.S.; FERREIRA, J.C.; ABRAO, A.Artigo IPEN-doc 19507 Review of brazilian activities related to the thorium fuel cycle and production of thorium compounds at IPEN-CNEN/SP2013 - LAINETTI, PAULO E.O.; FREITAS, ANTONIO A.; MINDRISZ, ANA C.Artigo IPEN-doc 16904 Uranium recovery from waste of the nuclear fuel cycle plants at IPEN-CNEN/SP2011 - FREITAS, ANTONIO A.; FERREIRA, JOAO C.; ZINI, JOSIANE; SCAPIN, MARCOS A.; CARVALHO, FATIMA M.S. deArtigo IPEN-doc 16885 Molybdenum adsorption by alumina and dowex 1x8 resin for the separation and purification process of fission sup(99)Mo2011 - YAMAURA, M.; DAMASCENO, M.O.; FREITAS, A.A.; CAMILO, R.L.; ARAUJO, I.C.; FORBICINI, C.A.L.G. de O.