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On the viability of wearing evaluation by Thin Layer Activation in the presence of non-occupationally exposed individuals

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Nuclear Science and Techniques 2022年第3期33卷 103-112页

作者： michel de almeida franca Julio Cezar Suita Paulo Fernando Ferreira Frutuoso e Melo Celso Marcelo Franklin Lapa Graduate Program of Nuclear Engineering COPPEFederal University of Rio de JaneiroRio de JaneiroRJ 21941914Brazil Instituto de Engenharia Nuclear(IEN-CNEN) Rio de Janeiro 21941614Brazil Comissao Nacional de Energia Nuclear(SEASE/DRS/CNEN) Rio de Janeiro 22290040Brazil

Thin Layer Activation is a nuclear technique that has key advantages over other wear measuring techniques for mechanical systems,especially for in site experiments on equipment important to safety in nuclear ***,it incurs radioactive dose and,thus,must be proved radiologically safe before use,otherwise,the utilization of this technique may be hindered *** said technique is safe previous to any operational/monetary cost is key,providing a methodology for this early assertion is the main contribution of this work—here,only non-occupationally exposed individuals are *** work offers a methodology,through a case study,to ascertain the Thin Layer Activation parameters to obtain safe levels of radioactive dose while maintaining statistically reliable *** methodology consists of using simulations,through the Monte Carlo Method,to obtain the floors and ceilings for the previously mentioned activation parameters based on operation and work conditions on site.

关键词： Thin Layer Activation Safety evaluation Simulation Equipment wearing

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Increasing analyzable steel thickness for thin layer activation experiments

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Nuclear Science and Techniques 2020年第3期31卷 35-44页

作者： Joao Francisco de Oliveira Antunes Mauro Lucio Borges Lemos michel de almeida franca Julio Cezar Suita Celso Marcelo Franklin Lapa Instituto de Engenharia Nuclear Rio de Janeiro 21941-614Brazil Programa de Engenharia Nuclear-COPPE/UFRJ Riode Janeiro 21941-450Brazil

The thin layer activation technique(TLA)is very effective in wear analysis for tribological systems where disassembly is costly or *** its development in the 1970s,TLA has been applied through direct irradiation of solid targets using ionizing particle beams to obtain an activation with a specific *** profile is then used to measure wear in a variety of *** experiments rely heavily on how deep the normalized activation *** of 30μm to 50μm are obtained for constant activation by the standard method,which for many experiments is ***,many others would benefit greatly from a 300μm constant activation layer,such as high-performance engines,softer alloys(brakes),and oil transport *** this aim was the goal of this ***,we needed to find an adequate irradiation line for the TLA ***,another technique/system was developed(the Attenuation Wheel),which would bring the depth of constant activation from 50μm to 300μm.

关键词： Thin layer activation Wear Proton beam Attenuation wheel

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Influence of Peritoneal Suture on the Formation of Abdominal Adhesions in Wistar Rats:Is Suturing Worthwhile?

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Surgical Science 2013年第9期4卷 401-404页

作者： Nathalia Andrade michel Vinagre Luciana Canabarro Willy Marcus franca Faculty of Medical Science and Health Catholic University of Sao PauloSao PauloBrazil Faculty of Medical Science and Health Pontifical Catholic University of Sao PauloSao PauloBrazil Laboratory of Experimental Surgery FCMSPUC/SPSao PauloBrazil

Purpose: The purpose of the present study was to determine the effect of peritoneal closure on the formation of abdominal adhesions by verifying their degree of damage on intestinal portions and the omentum with the abdominal wall. Given the different reports found in the literature concerning peritoneal closure mostly in obstetrics and gynecology, any objective information based on statistically tested results may be of great value in the everyday surgery practice. Material and Method: This is an experimental model on which a laparotomy is performed on the free cavity of the abdominal wall in growing rats. Young Wistar rats (approximately 1 month old) were operated through a long median xipho-umbilical abdominal incision. The animals were divided in 3 groups with fifteen rats each: in Group I, only the peritoneum was left open and all the other layers of the abdominal wall were closed;the rats in Group II had their peritoneums closed with unabsorbable cord (Prolene 4-0, Ethicon?). The abdominal wall of the rats in Group III (control) was only opened up to the musculature. The peritoneum, which remained intact and closed, was carefully prodded with the grip of tweezers to avoid lesions and/or perforations in the peritoneum. Results: There were no deaths nor incisional dehiscence and/or hernias among the animals. Nine animals of Group I presented adhesions (60%), whereas there were adhesions in all the fifteen animals of Group II (100%). In Group III adhesions were found in two animals (13%). The percentage of adhesions in Group II was significantly higher than those observed in Groups I and III (p 0.0001). Adhesions were mostly formed by the abdominal omentum. It was not observed any effect of the procedure on viscera. Conclusion: The experimental model that was suggested is appropriate for the establishment and study of peritoneal adhesions. The rate of adhesions found in the Group II was significantly higher (p 0.0001) than the rate observed in the Group I and Gro

关键词： Abdominal Adherence Incision Closure Peritoneal Suture

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