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Obtenção de biopolímeros de gelatina por radiação ionizante / Obtention of gelatin biopolymers by ionizing radiationTAKINAMI, PATRICIA Y.I. 21 January 2015 (has links)
Submitted by Claudinei Pracidelli (cpracide@ipen.br) on 2015-01-21T10:28:15Z
No. of bitstreams: 0 / Made available in DSpace on 2015-01-21T10:28:15Z (GMT). No. of bitstreams: 0 / Tese (Doutorado em Tecnologia Nuclear) / IPEN/T / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Estudo do efeito da radiação ionizante na utilização dos catalisadores desativados de craqueamento / Study of the effect of ionizing radiation for utilization of spent cracking catalystsKONDO, FERNANDO M. 23 February 2015 (has links)
Submitted by Maria Eneide de Souza Araujo (mearaujo@ipen.br) on 2015-02-23T19:40:28Z
No. of bitstreams: 0 / Made available in DSpace on 2015-02-23T19:40:28Z (GMT). No. of bitstreams: 0 / Dissertação (Mestrado em Tecnologia Nuclear) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Avaliação microbiológica, físico-química e sensorial de salada de repolho com cenoura minimamente processada após o tratamento por radiação gama destinado à pacientes imunocomprometidos ou com dietas especiais / Microbiological, physicochemical and sensory evaluation of cabbage and carrot minimally processed salad after radiation treatment intended to immunocompromised patients or with special dietsNUNES, THAISE C.F. 10 April 2015 (has links)
Submitted by Claudinei Pracidelli (cpracide@ipen.br) on 2015-04-10T16:49:05Z
No. of bitstreams: 0 / Made available in DSpace on 2015-04-10T16:49:05Z (GMT). No. of bitstreams: 0 / Tese (Doutorado em Tecnologia Nuclear) / IPEN/T / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Avaliação dos efeitos da radiação ionizante nos aspectos microbiológicos, físico-químicos e sensoriais de sorvetes / Evaluation of the ionizing radiation effects in microbiology, physical and chemical and sensory aspects of ice creamROGOVSCHI, VLADIMIR D. 10 April 2015 (has links)
Submitted by Claudinei Pracidelli (cpracide@ipen.br) on 2015-04-10T16:54:10Z
No. of bitstreams: 0 / Made available in DSpace on 2015-04-10T16:54:10Z (GMT). No. of bitstreams: 0 / Tese (Doutorado em Tecnologia Nuclear) / IPEN/T / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Aplicação de mapas auto-organizáveis na classificação de aberrações cromossômicas utilizando imagens de cromossomos humanos submetidos à radiação ionizante / Application of self-organizing maps for the classification of chromosomal aberrations using images of human chromosomes subjected to ionizing radiationCUNHA, KELLY de P. 23 July 2015 (has links)
Submitted by Claudinei Pracidelli (cpracide@ipen.br) on 2015-07-23T11:16:06Z
No. of bitstreams: 0 / Made available in DSpace on 2015-07-23T11:16:06Z (GMT). No. of bitstreams: 0 / Dissertação (Mestrado em Tecnologia Nuclear) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Estudo da influência da atividade radioativa presente no gerador de sup(99)Mo/sup(99m)Tc na esterilidade do produto terminado / Study of influence of sup(99)Mo/sup(99m)Tc generator radioactivity on the sterility of the finished productFUKUMORI, NEUZA T.O. 12 August 2015 (has links)
Submitted by Claudinei Pracidelli (cpracide@ipen.br) on 2015-08-12T12:31:56Z
No. of bitstreams: 0 / Made available in DSpace on 2015-08-12T12:31:56Z (GMT). No. of bitstreams: 0 / Tese (Doutorado em Tecnologia Nuclear) / IPEN/T / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Informatização e unificação dos programas de proteção radiológica: monitoramento das radiações ionizantes e sua otimização / Web-based system to unify the radiological protection programs: ionizing radiation monitoring and optimizationLEVY, DENISE S. 12 November 2015 (has links)
Submitted by Claudinei Pracidelli (cpracide@ipen.br) on 2015-11-12T10:44:49Z
No. of bitstreams: 0 / Made available in DSpace on 2015-11-12T10:44:49Z (GMT). No. of bitstreams: 0 / Tese (Doutorado em Tecnologia Nuclear) / IPEN/T / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Effects of exposure to continuous low doses of ionizing radiationMeehan, Kathleen Anne January 2001 (has links)
Thesis (DTech (Biomedical Technology))--Cape Technikon, 2001 / Ionising radiation has the ability to induce, inter alia, DNA damage and is well established as a causative agent of carcinogenesis and mutagenesis. The effects of high doses of short duration
have been well documented, whereas the effects of continuous exposure to low doses of ionising radiation have not, nor are they as clearly understood and current risk estimates are largely extrapolated from high-dose data of atomic bomb survivors. This study evaluated the clastogenic effects of low dose ionising radiation on a population of bats (Chiroptera) residing in an abandoned monazite mine. Bats were sampled from two areas in the mine, with external radiation levels measuring around 20 µSv/h (low dose) and 100 µSv/h (high dose). A control group of bats was collected from a cave with no detectable radiation above normal background levels.
The most frequently encountered genetic event in human malignancy is the alteration of the p53 gene. Mutant p53 proteins have a longer half-life than the wild-type variant and accumulate to high levels in the nucleus of tumour cells. The study showed that not only was there a significant increase in p53 positive cells of radiation exposed bats, but also in the degree of positivity, especially in the cells lining the bronchioles of the lungs.
Although experimental studies have shown that exposure to radiation may lead to the onset of fibrosis and an inflammatory response in the lung and other tissues, the magnitude of the dose exposure was not comparable to this study and histological examination of bat lung and liver tissues showed no morphological changes in radiation exposed bats when compared to the control group.
It has been documented that chronic radiation exposures may give rise to a number of specific haematological defects which are collectively termed "preleukemia" or myelodysplastic syndrome. Full blood counts on bat samples showed a significant decrease in the MCV indicating microcytic erythrocytes from the radiation exposed bats. Differential counts performed on the peripheral blood of the bats showed a marked neutropenia. Neutrophils also showed marked dysplasia including psuedo-Pelger Huet cells in radiation-exposed bats.
Cytochemical analysis using DAB myeIoperoxidase showed that control bats had hypogranular neutrophils andradiation-exposedbats had largely '1granularneutrophils. Bonemarrow biopsies
were taken from both control and radiation-exposed bats and evaluated for ceIlularity,
granulocyte: lymphocyte: erythrocyte (GLE) ratio and megakaryocyte morphology. A
hypocelIular bone marrow, a decreased granulocytic haematopoeisis and dysplastic
megakaryocyte morphology were observed in radiation-exposed bats. Mineralisation of bone
osteoid was determined using image analysis and showed a highly significant decrease in the
bone matrix from radiation-exposed bats. All haematological features observed are congruent
with current literature describing secondary (radiation-induced) myelodysplastic syndrome.
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Radiation doses for barium meals and barium enemas in the Western Cape South AfricaNabasenja, Caroline January 2009 (has links)
Thesis submitted in fulfilment of the requirements for the award of the
degree of
Master of Technology Radiography (Diagnostic)
in the Faculty of Health and Wellness Sciences
at the Cape Peninsula University of Technology
2009 / Since their discovery in 1895, the use of x-rays is continuously evolving in medicine
making the diagnosis of injuries and diseases more practicable. It is therefore not
surprising that x-rays contribute 90% of the radiation dose to the population from manmade
sources (DWP, 1992). Moreover, these radiation doses are associated with both
fatal and non-fatal cancer risk that is detrimental to adults between 20 to 60 years (Wall,
1996). Radiation dose to individuals therefore needs to be actively monitored in order to
minimise such risk. Barium contrast examinations were characterised as one of the
radiological examinations that contributed enormously to the collective dose to the
patients in the radiology department (DWP, 1992). Determining the diagnostic reference
levels of such examinations would reduce the over-exposure of individuals to ionising
radiation. Currently in South Africa (SA), there are no diagnostic dose reference levels
for barium meal (BaM) and barium enema (BaE) examinations. This study therefore
investigated the radiation doses delivered to patients referred for BaM and BaE,
obtained potential regional reference doses for these examinations, compared the
radiation doses obtained with those from similar dosimetry studies and investigated
sources of dose variation among the study sites.
A total of 25 BaM and 30 BaE patients in the age range 18 to 85 years, weighing 50 kg
to 90 kg, at 3 hospitals in the Western Cape, SA were investigated. The radiation dose
to the patients was measured using Dose Area Product (DAP) meters that were
permanently fitted onto fixed fluoroscopy units at these 3 hospitals. The third quartile
DAP values were 20.1 Gycm2 and 36.5 Gycm2 for BaM and BaE respectively. The
median DAP values were 13.6 Gycm2 and 27.8 Gycm2 for BaM and BaE respectively.
The median values were recommended as the potential Diagnostic Reference Levels for
BaM and BaE as they are less affected by outlying values of under or over- weight
(Yakoumakis, Tsalafoutas, Sandilos, Koulentianos et al, 1999). The weights of the
patients, fluoroscopy time, the number of images obtained, the use of digital or
conventional fluoroscopy equipment and the level of training of the radiologists were the
factors considered for dose variation among the 3 hospitals.
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Estrutura eletrônica do polímero orgânico conjugado MEH-PPV em solução sob radiação ionizante /Batagin Neto, Augusto. January 2009 (has links)
Orientador: Francisco Carlos Lavarda / Banca: Carlos Frederico de Oliveira Graeff / Banca: Paulo Monteiro Vieira Braga Barone / O Programa de Pós-Graduação em Ciência e Tecnologia de Materiais, PosMat, tem caráter institucional e integra as atividades de pesquisa em materiais de diversos campi da Unesp / Resumo: Os polímeros orgânicos conjugados têm sido amplamente utilizados em diversos campos tecnológicos devido às suas características semicondutoras e ópticas. Recentemente foi relatada a possibilidade de sua utilização na área de dosimetria. O polímero MEH-PPV, quando diluído em solventes que contenham halogênios, tem apresentado características bastante promissoras nesta área, contudo não há ainda uma completa compreensão dos mecanismos envolvidos. No presente trabalho realizou-se o estudo conformacional e da estrutura eletrônica do polímero MEH-PPV em clorofórmio e as possíveis alterações provenientes da irradiação desta solução com radiações ionizantes. Métodos de modelagem de materiais foram utilizados a fim de simular o sistema. Resultados experimentais sugerem que os efeitos observados são oriundos da interação do solvente com a cadeia polimérica. A fim de investigar tal possibilidade, uma análise dos prováveis sítios de maior reatividade sobre o polímero foi realizada, apontando um mecanismo de incorporação de radicais sobre a cadeia principal. / Abstract: Organic conducting polymers have been employed in several technological fields due to its semiconducting and optical properties. Recently, several reports points to applications in radiation dosimetry. When diluted in halogen-containing solvents, the polymer MEH-PPV shows interesting properties after gamma irradiation. Despite the promising application, still is lacking a complete understanding of the underlying phenomena. In the present work, we studied the geometry conformation and electronic structure of MEH-PPV in the presence of chloroform employing molecular modeling techniques to simulate the system. Several possibilities for polymer modification under gamma radiation were investigated, following suggestion from experimental results. Finally, a model for the color modifications of the solution is present. / Mestre
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