Several factors are considered in the modelling procedures: intrinsic factors to the reactor itself, factors which depend on the reactor's operational mode, isotope characteristic factors, and factors which depend on the type of rod failure. The model was applied for different reactor's operational parameters in the presence of failed rods.
The main conclusions drawn from the analysis of the model's output are relative to the variation on the coolant's water activity with the fuel burnup, the linear operation power and the primary purification rate and to the different behaviour of iodine and noble gases. The model was saturated from a certain failure size and showed to be unable to distinguish between a single big fail and many small ones. Evaluation of the contribution of contamination of radiotherapy room surfaces in the measure of exposure rate of radioiodine therapy patients; Avaliacao da contribuicao da contaminacao de superficies do quarto terapeutico na medida da taxa de exposicao de pacientes de radioiodoterapia.
The contamination of radiotherapy room surfaces is significant and the measures of patient exposure rate are held on the fourth dependencies, relevant questions are raised: the background radiation of the room stay high due to surface contamination, may interfere with the rate of patient exposure at the time of its release?
The monitoring site is important to determine whether the patient will be released? The value of the deal activity and the clinical condition of the patient may increase the contamination, influencing the monitoring results? This paper aims to conduct a quantitative analysis of surface contamination of the contribution of therapeutic room at the time is monitored exposure rate from inpatient.
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Measurements were made regarding the hospitalization of 32 patients with different doses administered activity, age and of both genders. The measurements were performed in the therapeutic rooms at the hospital Brotherhood Santa Casa de Misericordia de Sao Paulo. Exposure rate measurements were performed at the center of the room at 1 meter of the patient on the day of its release.
After his release and prior to decontamination, measurements were performed at predetermined landmarks within the therapeutic room. It can be considered that even with influence of contamination of surfaces, this is insignificant to determine if the patient may or may not be released. This study suggests that the site in which monitoring occurs exposure rate of the patient should not be decisive for liberation thereof. Phytochemical study and evaluation of anti-inflammatory activity of Aeschynomene fluminensis Vell.
Fabaceae ; Estudo fitoquimico e avaliacao da atividade anti-inflamatoria de Aeschynomene fluminensis Vell. Anti-inflammatory activity of the crude methanolic extract and its fractions was evaluated author. Evaluation of pollution effects in transmission lines located in industrial areas; Avaliacao dos efeitos da poluicao em linhas de transmissao situadas em regiao industrial. Kanashiro, Arnaldo G. This work aims to determinate a correlation between the pollution levels and electric power transmission lines maintenance procedures in order to establish the necessary procedures for specific pollution levels.
The methodology is presented. The results obtained in field tests and bench scale tests are presented and discussed. The so called pollution equivalent is determined for each site of the transmission line studied and maintenance procedures are established 6 refs. Evaluation of morphological changes of the skin after radiation-induced injury in Wistar rats; Avaliacao de alteracoes morfologicas da pele apos lesao radioinduzida em ratos Wistar.
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The cancer covers a heterogeneous group of more than diseases with different etiology and prognosis. Radiotherapy is one of the most commonly used treatment modalities, aiming at the destruction of cancer cells, using ionizing radiation. One of the limiting factors of radiotherapy is that radiation promotes the death of tumor cells in addition to injure healthy tissue neighboring the tumor, and may cause their death. Irradiation of the skin, accidental or for therapeutic purposes can trigger many injuries culminating in fibrosis, which implies functional alteration of the body. The evaluation of morphological effects associated with skin irradiation becomes essential to develop more effective radiation strategies and decreased morbidity; and in case of accidents, proper handling of the victim.
Evaluate radio-induced dermal changes using a Wistar rats model irradiated with 10, 40 and 60Gy. Male Wistar rats, aged approximately three months, were pre-anesthetized with midazolam and xylazine and anesthetized with sodium pentobarbital, shaved in the back, immobilized on polystyrene support in the prone position and irradiated with doses of 10, 40 and 60 Gy, with 4MeV nominal energy electron beams. After irradiation, the animals remained on constant evaluation, and the lesions were recorded photographically. The animals were divided into groups and were killed on the irradiation day, 5, 10, 15, 25 and days after irradiation.
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The sections were stained with hematoxylin-eosin, picrosirius red and immuno stained with antibody anti-TGF beta1. Another part of the tissue was fixed in 2. It was observed macroscopically the appearance of skin lesions similar to burns on the entire irradiated area. The optical microscope verified the early development of lesions in the 5 days group.
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After 10 days of irradiation it was already possible to see evidences of epidermal healing under the crust formed by the lesion. At 15 days after irradiation the tissue beneath the lesion had reconstructed epidermis. It was also observed the characteristics of tissue healing. It was also seen a significant polymorphonuclear cells infiltration. After 25 days at the higher doses the lesions remained, which did not occur at the lower dose, where the irradiated area of the animals were already completely healed.
After days of irradiation at 40Gy dose the wound was healed with the emergence of a well defined healed tissue. At the 60Gy dose, the lesion persisted in some animals, and in those that healing occurred the epidermis was a hypertrophied acanthosis. It was visualized a tissue with their morphological aspect completely mis characterized, where it's possible to view a necrotic tissue. The results of the scanning electron microscopy analysis corroborate with the in optical microscopy findings, where it's possible to visualize the distortion of collagen fibers at the higher dosages.
The results indicate that the used doses induced an important skin inflammatory process, activating the immune system.
This fact leads to an increase in the expression of TGF beta1, one of the responsible for the increased production of extracellular matrix ECM by various cell types, mainly fibroblasts in injured tissues. Besides the increased expression of ECM, the TGF beta1 also promotes the inhibition of the degradation processes of the same.
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The intense expression of cytokines in irradiated skin can trigger the fibrosis process; consequently, affect the homeostasis of this organ due to the accumulation of ECM. Evaluation of dosimetric effects caused by the table top of therapy; Avaliacao dos efeitos dosimetricos causados pelo tampo da mesa de tratamento. The attenuation and bolus effect for two tables top from different manufacturers were investigated for 6MV photons.
The bolus effect of couch was compared with 0,5cm bolus water equivalent. The same way that for attenuation, the surface dose was different for each region of couch Exact Couch and for different components of iBeam evo. The results of this study showed that table tops when in contact with surface of the patient may significantly increase surface dose and beam attenuation. Evaluation of quality of tomographs of Rio de Janeiro state, Brazil; Avaliacao da qualidade dos tomografos do estado do Rio de Janeiro. Travassos, P. Computerized tomographs used in 56 institutions in the state of Rio de Janeiro were evaluated.
Criteria of image quality and dosimetry were submitted. The results showed that some not performed optimize their protocols examinations or perform wrongly, which results in an increase in the dose received by patients, and an image in compromised quality. Assessment of effect of chemical treatment to carnauba's fibers straw; Avaliacao do efeito de tratamento quimico as fibras da palha de carnauba.
Carvalho, T. The use of natural fibers in composite materials has been highlighted in the scientific field. However, its application in polymer matrices usually requires surface modifications. The alkali treatment allowed the solubilization of the hemicellulose and lignin without causing changes to cellulose, as indicated by FTIR spectrophotometry and by the increase in crystallinity content. The samples showed the typical peaks of constituents of the fiber.duorenscessver.ga
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Estudo experimental em coelhos. In this study we evaluate the effects of the ionizing radiation on the rabbits femoral vein. The samples of femoral vein were obtained from 56 New Zealand rabbits, male with ageing from 90 to days, that were divided into 4 groups of 14 animals: one control group non-irradiated and three animal groups sacrificed 2 days, 14 days and 90 days after irradiation. In the three irradiated rabbits groups, each animal received the total dose cGy rads divided in 10 sessions of cGy, a dose equivalent that utilized on clinical therapeutic.
Immunohistochemical: reactions of immunoperoxidase with monoclonal mouse anti-human endothelial cell factor CD and anti-human Von Willebrand factor factor VIII , to study the vein endothelium. Electronic microscopy: transmission and scanning. With the methodology utilized we observe changes in the femoral vein of the animals submitted to irradiation in relation to the control group, thus described: there is formation of vacuoles between the endothelium and the basal membrane, called sub endothelial vacuoles, in focal areas.
Focal alterations are present in the endothelial surface with disorder in the setting and orientation of the endothelial cells. There is increase in the quantity of elastic fibers in the late stage, 90 days after irradiation, tending to normality. In this present study, the changes described are not accompanied by venous thrombosis.
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