ADEMAR JOSE POTIENS JUNIOR

ADEMAR JOSE POTIENS JUNIOR

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Technical feasibility study on volumetric reduction of radioactive wastes using plasma technology
2017 - PRADO, E.S.P.; DELLAMANO, J.C.; CARNEIRO, A.L.G.; SANTOS, R.C.; PETRACONI, G.; POTIENS JUNIOR, A.J.
The radioactive waste arising from nuclear reactors, hospitals, industry and research institutes are generated daily with a considerable amount. To final dispose of these radioactive waste safely and cost effectively, they must be transformed into physical and chemical compounds suitable for radionuclides immobilization with maximum volume and exhaust gaseous reduction. In this scope, among the promising technologies for the radioactive waste treatment, plasma technology allows reducing substantially the waste volume after exposing them to temperatures above 2,500ºC. In the planning and management of radioactive waste, the challenges related to plasma technology are presented as a motivation factor for the possible implantation of plasma reactors in nuclear plants and research centers aiming at improving the process of radioactive waste management.
A new storage facility for institutional radioactive wastes at IPEN
2015 - VICENTE, ROBERTO; DELLAMANO, JOSE C.; POTIENS JUNIOR, ADEMAR J.
IPEN, the Nuclear and Energy Research Institute in Sao Paulo, Brazil, has been managing the radioactive wastes generated in its own activities of research and radioisotope production as well as those received from many radioisotope users in the country since its start up in 1958. Final disposal options are presently unavailable for the wastes that cannot be managed by release after decay. Treated and untreated wastes including disused sealed radioactive sources and solid and liquid wastes containing radionuclides of the uranium and thorium series or fission and activation products are among the categories that are under safe and secure storage. This paper discusses the aspects considered in the design and describes the startup of a new storage facility for these wastes.
Implementation of a computerized system for the management of radioactive lightning rods and smoke detectors
2013 - NASCIMENTO, RAFAEL A. do; DELLAMANO, JOSE C.; POTIENS JUNIOR, ADEMAR J.
Laser decontamination of the radioactive lightning rods
2012 - POTIENS JUNIOR, ADEMAR J.; DELLAMANO, JOSE C.; VICENTE, ROBERTO; WETTER, NIKLAUS U.; LANDULFO, EDUARDO; RAELE, MARCUS P.
Characterization of radioactive wastes - spent ion-exchange resins and charcoal filter beds
2009 - SILVA, ROZILENE E.; ISIKI, VERA L.K.; GOES, MARCOS M. de; POTIENS JUNIOR, ADEMAR J.; DELLAMANO, JOSE C.; VICENTE, ROBERTO
Monte Carlo method to characterize radioactive waste drums
2013 - LIMA, JOSENILSON B.; DELLAMANO, JOSE C.; POTIENS JUNIOR, ADEMAR J.
Gestao de rejeitos radioativos no IPEN - 25 anos de historia
2006 - DELLAMANO, JOSE C.; VICENTE, ROBERTO; MARUMO, JULIO T.; POTIENS JUNIOR, ADEMAR J.; MIYAMOTO, HISSAE; HIROMOTO, GORO
Experience in the management of disused lightning rods containing sup(241)Am in a Research Institute in Brazil
2013 - VICENTE, ROBERTO; POTIENS JUNIOR, ADEMAR; SAKATA, SOLANGE; DELLAMANO, JOSE
Radioactive lightning rods (RLR) were manufactured and installed in Brazil for almost two decades, before they were prohibited in 1989. Structures protected by this type of lightning preventers included residential buildings, schools, commercial and industrial facilities, among others. It is estimated that about 3.4 TBq of 241Am were used by manufacturers, and a total of 75,000 pieces with a mean activity of about 46 MBq were in the market. While only a fraction of the total has been recovered, the almost twenty thousand pieces already collected at the Nuclear and Energy Research Institute (IPEN) had their sources successfully separated from the remaining recyclable metal scrap and are now encapsulated in lead containers for final disposal.
Laser decontamination of the radioactive lightning rods
2014 - POTIENS JUNIOR, A.J.; DELLAMANO, J.C.; VICENTE, R.; RAELE, M.P.; WETTER, N.U.; LANDULFO, E.
Between 1970 and 1980 Brazil experienced a significant market for radioactive lightning rods (RLR). The device consists of an air terminal with one or more sources of americium-241 attached to it. The sources were used to ionize the air around them and to increase the attraction of atmospheric discharges. Because of their ineffectiveness, the nuclear regulatory authority in Brazil suspended the license for manufacturing, commerce and installation of RLR in 1989, and determined that the replaced RLR were to be collected to a centralized radioactive waste management facility for treatment. The first step for RLR treatment is to remove the radioactive sources. Though they can be easily removed, some contaminations are found all over the remaining metal scrap that must decontaminated for release, otherwise it must be treated as radioactive waste. Decontamination using various chemicals has proven to be inefficient and generates large amounts of secondary wastes. This work shows the preliminary results of the decontamination of 241Am-contaminated metal scrap generated in the treatment of radioactive lightning rods applying laser ablation. A Nd:YAG nanoseconds laser was used with 300 mJ energy leaving only a small amount of secondary waste to be treated.