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| Manzoli,José Eduardo; Carvalho,Valdir de Souza; Cerqueira,Eliomar Jacinto Gomes de. |
| Irradiation of samples in peculiar experimental apparatus, subject to radiation spread, requires a special evaluation of absorbed dose implanted to the sample. Indirect calibration of the irradiation source, obtained in a different apparatus, and the spread, usually of very difficult theoretical evaluation, can cause very serious measurement errors, sometimes reaching 50%. In this work, the procedure for dose evaluation in an apparatus for beta irradiation of samples, usually biological ones,is presented, making use of calibration curves, obtained by irradiation in advance of thermoluminescent detectors in air, and so irradiating them in the same position of the sample. An application in blood sample irradiation is also presented. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beta irradiation; Beta dosimetry; Thermoluminescence; Biological irradiation. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000200008 |
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| Manzoli,José Eduardo; Campos,Vicente de Paulo de; Doi,Mirian Saori. |
| Measurement response of thermoluminescent dosimeter, TLD, used by workers or placed at positions where gamma radiation field could be in action affecting biological tissues, should be completely characterized, in order to achieve the radiation quantity with precision and confidence. Among the evaluations concerned to its characterization, the detector reproductibility is of fundamental importance, because detectors present inside the TLD will be used many times in routine. Reproductibility is studied by repeated exposure to the same radiation field. The minimum detection limit is another important characteristics of a TLD. In this work evaluations of reproductibility and minimum detection are presented, for dosimeters produced at IPEN. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Detector selection; Personal dosimetry; Environmental dosimetry. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000200009 |
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| Félix,Juliana Silva; Padula,Marisa; Manzoli,José Eduardo; Monteiro,Magali. |
| Este trabalho teve como objetivo desenvolver e validar método analítico para determinar ε-caprolactama no simulante de alimentos solução de ácido acético 3% e estudar sua migração de embalagens contendo poliamida 6 para o simulante em contato. Foi empregada a cromatografia gasosa usando ε-caprolactama como padrão analítico e 2-azociclononanona como padrão interno. A linearidade esteve entre 1,60 e 640,00 µg de ε-caprolactama.mL-1 de simulante, com coeficiente de correlação 0,9999. Os limites de detecção e de quantificação do método foram 0,24 e 1,60 ng, respectivamente. A precisão do método revelou valores de coeficiente de variação menores que 4,3% e a avaliação da exatidão mostrou recuperação de 100 a 106%. O método demonstrou ser eficaz para quantificar... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Migração; Ε-caprolactama; Poliamida 6; Simulante de alimento; Validação de método analítico; Cromatografia gasosa de alta resolução. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612007000500005 |
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