MARCOS OLIVEIRA DAMASCENO
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Artigo IPEN-doc 26232 Study of new routes for purification of fission (99)Mo2019 - DAMASCENO, MARCOS O.; MARQUES, FERNANDA A. da S.; DIAS, RICARDO R.; SANTOS, JACINETE L. dos; FORBICINI, CHRISTINA A.L.G. de O.99mTc is the most widely applied medical radioisotope in the world, especially for cancer diagnosis procedures. It is provided by 99Mo radioactive decay, which is one of the fission products of irradiated uranium by nuclear reactors. At main production centers, 99Mo chemical processing line up different steps to separate it from other fission products, depending on features of targets or local requirements. In this work, two new routes (MR1 and MR2) for 99Mo purification are presented, called MR1 and MR2, can be set up in the Brazilian Multipurpose Reactor project (RMB). In the first studied route, 99Mo purification initiated by eluting the solution through a Dowex 1x8 resin chromatography column, followed by a second step using a Chelex resin column and finally, the process was finished using an alumina column. For a second route, the first step is also performed with a Dowex 1x8 column, followed by a second separation step using alumina column, and lastly, a sublimation process was carried out in a tubular oven under programmed conditions. The final yield for the MR1 route has reached 84.4% and the overall time process about 7 hours, by contrast, MR2 route came to 75.3% in 9 hours.Artigo IPEN-doc 24142 Recovery of 131I from fission 99Mo production process by distillation method2017 - DAMASCENO, MARCOS O.; BALOGH, TATIANA S.; FORBICINI, CHRISTINA A.L.G. de O.The results of one of the recovery stages of 131I as a byproduct of the 99Mo fission production process are presented in this work. A modified wet-distillation apparatus was used for iodide purification and some work parameters were tested. The assays included iodide anion eluent, concentration of H2SO4, H2O2, the catalyst effect of MoO3, temperature and time process. The results of eluting anions demonstrated lower recovery of 131I using nitrate salt. The sulfate solution and its respective acid (H2SO4) at concentration 1.6 M, presented better results. Hydrogen peroxide was used as a main oxidant of the ions iodide, the experiments realized with 6 mL of H2O2 3% showed higher recovery than assays prepared with H2O2 higher and lower amount. Molybdenum oxide was evaluated as catalyst of iodine in solution; however, the results did not demonstrate an advantage in relation to its absence. In addition, the recovery of iodide was delayed at initial periods of the process in presence of the catalyst, leading to an increase on time process. Temperature decrease of distillation solution from 80 to 50 °C showed advantageous since the recovery yields were similar beside a lower wet drag to trap solution. Time distillation was carried out at least four hours with sampling each hour; the best times were between 1 and 2 hours. Shorter periods of distillation avoid dilution of the capture solution on the further recovery process. Several parameters were studied and it was possible to set up system that provided 131I recovery around 50% yield.Artigo IPEN-doc 19411 Adsorption behavior of sup(99)Mo using AGI-X8 anionic resin2013 - SANTOS, JACINETE L. dos; YAMAURA, MITIKO; DAMASCENO, MARCOS O.; FORBICINI, CHRISTINA A.L.G.O.Artigo IPEN-doc 19277 Studies on molybdenum elution study in dowex 1x8 resin applied on purification process of fission sup(99)Mo2013 - DAMASCENO, M.O.; YAMAURA, M.; SANTOS, J.L. dos; FORBICINI, C.A.L.G. de O.Artigo IPEN-doc 19251 Study on optimum conditions for Mo-99 adsorption by magnetite nanoparticles2013 - HOLLAND, HELBER; YAMAURA, MITIKO; DAMASCENO, MARCOS O.; SANTOS, JACINETE L.Artigo IPEN-doc 19246 Biomass as biosorbent for molybdenum ions2013 - YAMAURA, MITIKO; SANTOS, JACINETE L. dos; DAMASCENO, MARCOS O.; EGUTE, NAYARA dos S.; MORAES, ADENIANE A.N.; SANTOS, BRUNO Z.Artigo IPEN-doc 19237 Proposal of a separation process for the production of Mo-992013 - YAMAURA, MITIKO; DAMASCENO, MARCOS O.; SANTOS, JACINETE L. dos; EGUTE, NAYARA dos S.Artigo 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.Artigo IPEN-doc 17132 Study of molybdenum adsorption isotherms on acidic alumina and neutral alumina2011 - YAMAURA, MITIKO; FREITAS, ANTONIO A.; DAMASCENO, MARCOS O.; EGUTE, NAYARA dos S.; FORBICINI, CHRISTINA A.L.G. de O.