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X-ray and gamma ray shielding behavior of concrete blocks
Hernandez-Murillo Christian Geovanni,Molina Contreras J. Rafael,Escalera-Velasco Luis Alberto,de Leon-Martínez Héctor Asael,Rodriguez-Rodriguez José Antonio,Vega-Carrillo Héctor Rene 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.8
The shielding characteristics of two concrete blocks, widely used in the building industry in Mexico have been determined. These characteristics include the mass interaction coefficients, the linear attenuation coefficients and the half-value layers. The energy-dispersed X-ray fluorescence shows that the percentage mass content of each atom in the sample, and the atomic volume of the constituent elements of a material, plays an important role in its shielding capabilities. The total linear attenuation coefficients and the half-value layers were analyzed for a set of photon energies related to X-rays for diagnosis and cancer treatment with linear accelerators. Our results show that the concrete blocks have similar photon attenuation coefficients than the Portland concrete and better features than gypsum
Juan Luis Gó,mez-Amador,Marcos Vinicius Sangrador-Deitos,Luis Alberto Rodriguez Hernandez,Aldo Gabriel Eguiluz Melé,ndez 대한두개저학회 2021 대한두개저학회지 Vol.16 No.2
Fibrous dysplasia (FD) is a rare, benign disease, characterized by the replacement of normal medullary bone by fibro-osseous tissue. It is caused by somatic mutations in the α subunits of the stimulatory G protein encoded by the GNAS gene. FD can be divided into three categories. FD must be considered with any clival, sellar or parasellar lesion, especially with bone affection. Visual disturbances are one of the most disabling complications of this disease, secondary to optic canal compression. There is still controversy whether unroofing of the optic canal should be performed in these cases. We present the case of a 30-year-old woman who presented to our institution with a 3 weeks history of headache and blurred vision, for which a neuronavigated transnasal endoscopic resection was planned. We present a novel surgical approach, in which we performed a conventional transellar approach, with complete resection of an osseous lesion which infiltrated the sella turcica and clivus. Unroofing of the left optic canal and complete decompression of the optic nerve were performed, as well as an extradural clinoidectomy.