Radioisotopes
Mostrando 13-24 de 101 artigos, teses e dissertações.
-
13. Immunophenotype characterization of poorly differentiated breast carcinomas / Quantificação do RNAm de tireoglobulina em sangue periférico de pacientes com câncer diferenciado de tireóide: acompanhamento a longo prazo
The differentiated thyroid carcinoma (DTC) encloses 95% of all thyroid malignant disease. In USA, it increased 2,4 times in recent years (1973- 2002). The treatment includes total thyroidectomy, ablation with radioiodine (RAI) followed by TSH suppression with L-Thyroxine. The cancer recurrence occurs in 20% of the cases. Periodic evaluation through imaging e
Publicado em: 2009
-
14. Gestão de rejeitos radioativos em serviços de medicina nuclear / Gestão de rejeitos radioativos em serviços de medicina nuclear
Radioisotope applications in nuclear medicine services, for diagnosis and therapy, generate radioactive wastes. The general characteristics and the amount of wastes that are generated in each facility are function of the number of patients treated, the procedures adopted, and the radioisotopes used. The management of these wastes embraces every technical and
Publicado em: 2008
-
15. Aplicação de método Monte Carlo para cálculos de dose em folículos tiroideanos
The Monte Carlo method is an important tool to simulate radioactive particles interaction with biologic medium. The principal advantage of the method when compared with deterministic methods is the ability to simulate a complex geometry. Several computational codes use the Monte Carlo method to simulate the particles transport and they have the capacity to s
Publicado em: 2008
-
16. InfluÃncia do posicionamento da paciente na modificaÃÃo da dose em ÃrgÃos crÃticos na braquiterapia de alta taxa de dose em cÃncer de colo uterino
High dose rate brachytherapy is a medical procedure which uses radioisotopes with dose rate over 0.2 Gy/min. This kind of treatment is commonly used on uterine cancer in more advanced stages of the disease. The brachytherapy of high dose have substituted the low dose rate modality because it is a treatment performed at clinic and without the need for anaesth
Publicado em: 2008
-
17. Evolução bioquímica através de medidas seriadas de antígeno prostático específico (PSA) de pacientes submetidos a braquiterapia com implante de sementes de 125I no tratamento do adenocarcinoma de próstata / Biochemical outcome of patients with prostate adenocarcinoma treated with 125I seed implantation measured by serial dosages of prostate specific antigen
INTRODUÇÃO: Nos pacientes com câncer de próstata considerados de baixo risco, a braquiterapia de baixa taxa de dose (BBTD) utilizando sementes de 125I é uma excelente opção, com seguimento após o tratamento, devendo ser feito por meio de medidas seriadas de PSA. A avaliação de falha bioquímica após radioterapia, definida por elevação do PSA, te
Publicado em: 2008
-
18. Estudo da imobilização de rejeitos radioativos em matrizes asfálticas e resíduos elastoméricos utilizando a técnica de microndas / STUDY OF IMMOBILIZATION OF RADIOACTIVE WASTES IN ASPHALTIC MATRICES AND ELASTOMERIC RESIDUES BY USING MICROWAVE TECHNIQUE
In the present work, the technique of microwave heating was used to study the immobilization of low and intermediate activity level radioactive waste, such as spent ion exchange resin used to remove undesirable ions of primary circuits of refrigeration in water refrigerated nuclear reactors, and those used in chemical and radionuclide separation columns in t
Publicado em: 2007
-
19. Caracterização química e toxicológica da água produzida descartada em plataformas de óleo e gás na costa brasileira e seu comportamento dispersivo no mar
The production of oil and gas is usually accompanied by the production of water, also known as produced water. Studies were conducted in platforms that discharge produced water in the Atlantic Ocean due to oil and gas production by Petrobras from 1996 to 2006 in the following basins: Santos (Brazilian south region), Campos (Brazilian southeast region) and Ce
Publicado em: 2007
-
20. STUDY OF IMPORTANT PARAMETERS ON THE IRRADIATION OF 124Xe, TO IMPROVE THE PRODUCTION OF 123I WITH HIGH PURITY USING THE CYCLONE-30 CYCLOTRON AT IPEN-CNEN/SP / Estudo de parâmetros relevantes na irradiação de 124-Xe, visando a otimização na obtenção de 123-I ultra puro no Ciclotron Cyclone-30 do IPEN-CNEN/SP
The development of diagnosis equipment and therapy procedures in nuclear medicine depends on the availability of commercial radioisotopes. IPEN is the most important institution that provides radioisotopes for national market. In order to achieve this function, IPEN had invested in the acquisition of a 30 MeV Cyclone-30 cyclotron to produce mainly 18F, 67Ga,
Publicado em: 2006
-
21. Determinação das doses efetivas por ingestão de farinhas de cereais atráves da espectrometria de raios gama
The health impact from radionuclides ingestion of foodstuffs was evaluated by the committed effective doses determined in commercial samples of South-Brazilian cereal flours (soy, wheat, corn, manioc, rye, oat, barley and rice flour). The radioactivity traces of 228Th, 228Ra, 226Ra, 40K, 7Be and 137Cs were measured by gamma-ray spectrometry employing a 66% r
Publicado em: 2006
-
22. Evaluation of the waste profile from (medical) health services of Belo Horizonte concerned to the presence of radioactive wastes in the disposal system / Avaliação do perfil dos resíduos de serviços de saúde de Belo Horizonte quanto à presença de rejeitos radioativos na destinação final
The medical procedures of diagnosis and treatment that use radiopharmaceuticals generate radioactive wastes that can, after reaching the release limit, follow the conventional ways of collection and disposal of the urban solid wastes. This research aims to detect radiometrically the presence of radioactive wastes in the health-care wastes at the final dispos
Publicado em: 2005
-
23. The capacity of Saccharomyces cerevisiae to reduce aflatoxicosis and its effect on the distribution and excretion of AFB13H in rats / Saccharomyces cerevisiae na redução de aflatoxicoses e o efeito na distribuição e na excreção da radioatividade de AFB13H em ratos
Para avaliar o efeito de diferentes linhagens de leveduras, Saccharomyces cerevisiae, vivas, na redução de aflatoxicoses e, contribuir para o entendimento do modo de ação destas leveduras sobre aflatoxina B1 marcada com trítio (AFB13H), foram conduzidos três experimentos. No primeiro experimento, foram utilizados ratos Wistar para investigar o efeito d
Publicado em: 2005
-
24. Spatial variability and Cesium-137 inventories in native forest
With the nuclear fission discovery and development of nuclear weapons in 1940s, artifi cial radioisotopes were introduced in the environment. This contamination is due to worldwide fallout by superfi cial nuclear tests realized from early 1950s to late 1970s by USA, former URSS, UK, France and China. One of theses radioisotopes that have been very studied is
Brazilian Journal of Physics. Publicado em: 2004-09