RESUMO
The present work is a part of a project dedicated to measure the marine radioactivity near the Saudi Arabian coasts of the Red Sea and Arabian Gulf for establishing a marine radioactivity database, which includes necessary information on the background levels of both naturally occurring and man-made radionuclides in the marine environment. Farasan Islands is a group of 84 islands (archipelago), under the administration of the Kingdom of Saudi Arabia, in the Red Sea with its main island of Farasan, which is 50 km off the coast of Jazan City. The levels of natural radioactivity of (238)U, (235)U, (226)Ra, (232)Th and (40)K and man-made radionuclides such as (137)Cs in the grab sediment and water samples around Farasan Island have been measured using gamma-ray spectroscopy. The average activity concentrations of (238)U, (235)U, (226)Ra, (232)Th, (40)K and (137)Cs in the sediment samples were found to be 35.46, 1.75, 3.31, 0.92, 34.34 and 0.14 Bq kg(-1), respectively.
Assuntos
Radioisótopos de Césio/análise , Sedimentos Geológicos/análise , Monitoramento de Radiação/métodos , Radioisótopos/análise , Calibragem , Césio/análise , Bases de Dados Factuais , Raios gama , Geografia , Sedimentos Geológicos/química , Oceano Índico , Radioisótopos de Potássio/análise , Radioatividade , Rádio (Elemento)/análise , Radônio/análise , Reprodutibilidade dos Testes , Arábia Saudita , Software , Poluentes Radioativos do Solo , Espectrometria gama , Tório/análise , Urânio/análiseRESUMO
There are different approaches for the repair of congenital choanal atresia. A stent is usually inserted in the nostrils to prevent restenosis. We describe a case of an infant who was presented with recurrent choanal stenosis and was managed by a stent made of reinforced silicone rubber tracheal tube. The tube has several advantages over other known stents.
Assuntos
Atresia das Cóanas/cirurgia , Stents , Constrição Patológica , Humanos , Lactente , Masculino , Desenho de Prótese , Recidiva , Elastômeros de Silicone/uso terapêuticoRESUMO
Concentrations of radionuclides in surface soil across the Nile Delta, the north coast of Egypt, and Middle Egypt have been measured using a hyperpure germanium spectrometer. The concentrations obtained for 40K, the 232Th series, and the 226Ra series are expressed in Bq kg-1 of dry weight, and the exposure rates are expressed in nGy h-1 of wet weight. The activity concentrations of 137Cs in soil are expressed in Bq m-2.
