RESUMO
Polymer-carbon nanostructures have been used as gamma-ray dosimeters. The thickness of the sensitive volume material plays an important role in the determination of the dosimetry response. In this work, the thickness effect of a real-time dosimeter based on the Epoxy/Multi-walled carbon nanotube (MWCNT) nanocomposite was investigated. The amount of electrical percolation threshold (EPT) for Epoxy/MWCNT nanocomposite was initially simulated using the finite element method. Then, the 0.1 MWCNT wt% nanocomposite was fabricated using a solution method with three thicknesses of 1, 2, and 3 mm. FESEM images demonstrated a good dispersion state of the inclusions into the Epoxy matrix. The samples were irradiated by gamma-rays of Co-60 source over the dose rates of 25-166 mGy/min. In addition, dosimetric characteristics were performed, including linearity, bias-polarity, angular dependence, energy dependence, field size, and repeatability. Results revealed that with increasing the thickness, the dosimetry response was enhanced remarkably.
RESUMO
Introduction and importance: Post Laparoscopic cholecystectomy ascites is a rare complication that might be due to biliary leak, lymph duct injuries, infections, peritoneal reaction bowel injuries, malignancies and etc. Case presentation: Here we have reported post-cholecystectomy ascites presented with hypovolemic shock in a women of unknown origin. Different possible etiologies have been ruled out for her but her intra-peritoneal secretions had been decreased about one week of hospitalization and was discharged without figuring out its etiology. Clinical discussion: Post-cholecystectomy ascites is a rare condition that could be caused by biliary leak, lymphatic leak, ovarian hyper stimulation syndrome, infections, peritoneal reactions and malignancies that all of them should be considered for these patients to manage their problem. Conclusion: The exact cause of ascites in the presented case was still unknown and the condition was controlled by administration of corticosteroids, octreotide, albumin, and insertion of the stents in biliary ducts. More investigation esp. on immunologic causes are needed.