Examinando por Autor "Munevar Espitia, Edwin"
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Ítem Determinación de la constante de Planck a partir del contraste del Diodo PT 202C y el espectrómetro de fibra ópticaRojas Rojas, Gustavo Adolfo; Camelo Perdomo, Laura Mercedes; Munevar Espitia, EdwinThe present work has as objective to show the innovation raised for the characterization of the Planck curve from the use of the optical fiber and the PT202C diode, being this one of the raised objectives, besides having a practical and more resistant assembly for the use of the students of the district university where the experiment of the photoelectric effect is evidenced as much in its historical advance as in its experimental advance. It shows the entire timeline to reach the discovery of Planck's constant and also to talk about this curve, it also shows the assemblies used to demonstrate the use of the optical fiber and the PT202C diode where the photoelectric effect is generated as such, The data obtained are shown in the corresponding graphs, the data were replicated at different distances with potential difference in the source that varied from 0 V to 12 V, finally we arrive at a Planck constant, in which the uncertainty is associated with the way in which the temperature data are taken.Ítem Estudio computacional en Gate de la interacción de protones con tejidos biológicos y con yoduro de sodio dopado con talioSantana Gil, Johan Sebastian; Munevar Espitia, Edwin; Leyva Rojas, José AlfonsoThe physics of ionizing radiation plays a fundamental role in the development of dosimetry, since it deals strictly with the measurement of the absorbed dose as a result of the interaction between ionizing radiation and matter. To carry out such dose measurement, in some cases materials with a crystalline structure are implemented, such as scintillator material (sodium iodide doped with thallium), which can be adapted as dosimeters. The scintillation counter is based on the principle that light is emitted when the scintillator material is exposed to radiation, this occurs because part of the energy deposited by the incident radiation is absorbed by the material: this implies that the molecular structure is excites by ionizing the compound, showing a change in its electronic configuration. As the material is ionized, the electrons acquire energy but after a certain time they return to their fundamental state, emitting radiation (photons). Assuming that the crystalline material to be handled is thallium-doped sodium iodide, a simulation will be implemented in a Geant4 extension called Gate; in order to determine the dose delivered to sodium iodide with thallium impurities [NaI(Tl)]. Similarly, a biological tissue (pancreas) will be irradiated with protons in the Gate computational tool, to determine its respective dose. Once these dose values are obtained, they will be compared in order to establish whether sodium iodide is a material that resembles the response to radiation with respect to the response of a biological tissue such as the pancreas. The development of this work will aimed at carrying out the corresponding computational simulations in the Gate extension with the purpose of grounding the comparisons between the inorganic material [NaI(Tl)] and the organic material (pancreas), that is, to study the response of sodium iodide doped with thallium and the pancreas by exposing them to radiation from a proton beam.Ítem Estudio computacional en Geant 4 de la interacción de protones con tejidos biológicos y con fluoruro de litio dopado con manganesoAgudelo Mora, Álvaro Jair; Munevar Espitia, Edwin; Leyva Rojas, José AlfonsoThe thermoluminescence phenomenon is caused by the interaction between a doped chemical compound and incident radiation; said compound is ionized by changing its electronic configuration. After that, this material is heated to a certain temperature so that the electrons return to their initial configuration, emitting radiation in the form of photons. In particular, there is special interest in Lithium Fluoride as a thermoluminescent material, due to its possible uses and applications in various areas, such as dosimetry and medical physics, among others. In such a way, that studies for this type of crystals are required, in this work a computational simulation will be carried out in Geant4, in order to determine the dose received by Lithium Fluoride (LiF) doped with impurities of Manganese (Mn), when irradiated with Protons at certain energy ranges. A biological tissue (skin) will also be irradiated with protons in Geant4 and the corresponding dose will be determined. This in order to compare the doses obtained in both cases and thus be able to establish whether LiF is a material that resembles the response to radiation similar to that of soft tissue such as skin. In this work we want to carry out the respective computational simulations in Geant4, in order to establish comparisons between the inorganic and biological systems, ie, study the response of Lithium Fluoride (LiF) doped with Manganese (Mn) impurities and of the biological tissue (SKIN) when irradiated with protons.Ítem Evaluación computacional de la carga microbiológica en biomembranas bajo tratamiento con radiación ionizantePáez Moncaleano, Mariana; Munevar Espitia, Edwin; Leyva, José AlfonsoIn this research we propose an application of PDB4DNA program elaborated by [6]. This program was designed to study the interaction between genetic material and ionizing radiation in a virtual way. We propose the implementation of calculus and computational modeling with centres of mass.We propose too the graphication of new biological molecules like proteins and membranes. To make this possible we follow a serie of objectives and made an exhaustive investigation around physicist, biology and computation subjects.Ítem Evaluación computacional de la dinámica estructural de una biomolécula, luego de su interacción con partículas cargadas.Rubio Cepeda, Luis Miguel; Munevar Espitia, Edwin; Leyva Rojas, José AlfonsoIn the field of research on the interaction of radiation and matter, a space has been opened for computational simulations, Which has turned into an important tool in the development of an investigation and in the approximation to the possible results that can be obtained when experimenting. This work presents the results of the effects of charged particles in the three dimensional structure of a biomolecule based on an simulation (pdb4dna) of the geant4 toolset, modified for the purpose of evaluating some parameters after the interaction of a biomolecule (1bb3.pdb) with radiation,These results were obtained during the internship development. On the other hand, the data was obtained by throught a new simulation, which was detached from the base code, where it obtains from deposited energy values. The analysis shown was done through ROOT software in order to compare the partial similarities among the two codes.