نتایج جستجو برای: dosimetric characteristics monte carlo simulation

تعداد نتایج: 1231401  

2011
Sedigheh Sina Reza Faghihi Ali S. Meigooni Simin Mehdizadeh M. Amin Mosleh Shirazi Mehdi Zehtabian

In this study, dose rate distribution around a spherical 137Cs pellet source, from a low-dose-rate (LDR) Selectron remote afterloading system used in gynecological brachytherapy, has been determined using experimental and Monte Carlo simulation techniques. Monte Carlo simulations were performed using MCNP4C code, for a single pellet source in water medium and Plexiglas, and measurements were pe...

Kinetic Monte Carlo simulation was applied to investigation of kinetics and mechanism of oxalic acid degradation by direct and heterogeneous catalytic ozonation. La-containing perovskites including LaFeO3, LaNiO3, LaCoO3 and LaMnO3 was studied as catalyst for oxalic acid ozonation. The reaction kinetic mechanisms of each abovementioned catalytic systems has been achieved. The rate constants val...

Introduction: The choice of optimal radionuclides for radioimmunotherapy depends on several factors, especially the radionuclide and antibody. The dosimetric characteristics of a non-internalizing and an internalizing monoclonal antibody (MAb) labeled with beta emitting radionuclides were investigated. Methods: Using Geant4-DNA Monte Carlo simulation, we ...

In this paper, we deal with the pricing of power options when the dynamics of the risky underling asset follows the double stochastic volatility with double jump model. We prove efficiency of our considered model by fast Fourier transform method, Monte Carlo simulation and numerical results using power call options i.e. Monte Carlo simulation and numerical results show that the fast Fourier tra...

Journal: :مهندسی صنایع 0
الهام حسن نایبی مهندسی صنایع بهداد کیانی مهندسی سیستمهای انرژی

monte carlo simulation is a standard technique for project risk analysis. however, some assumptions of this technique are not reasonable in real world. when a project falls behind the schedule, managers take actions to improve the performance. nevertheless, most of the simulation models as monte carlo omit these reactions in their analysis, which results in unreasonable wide distributions or ev...

Journal: :journal of physical & theoretical chemistry 2009
m. monajjemi a. r. oliaey

the determination of gyration radius is a strong research for configuration of a macromolecule. italso reflects molecular compactness shape. in this work, to characterize the behavior of theprotein, we observe quantities such as the radius of gyration and the average energy. we studiedthe changes of these factors as a function of temperature for acetylcholine receptor protein in gasphase with n...

Journal: :basic and clinical cancer research 0
mina salemi master student of physics, dept basic science, islamic azad university central tehran branch, tehran, iran hasan nedaei assistant professor, radiotherapy physics dept, cancer institute, tehran university of medical science, iran s gholami assistant professor, radiotherapy physics dept, cancer institute, tehran university of medical science, iran

background: the purpose of this study was to investigate the application of the monte carlo technique to calculate and analysis of dosimetric parameters for electron beams used in radiotherapy. this technique is based on statistical method and has a powerful role in different radiotherapy aspects. materials and methods: the simulated medical linear accelerator was the varian clinac 2100c. the e...

2016
Hiroyuki Okamoto Akihisa Wakita Satoshi Nakamura Shie Nishioka Ako Aikawa Toru Kato Yoshihisa Abe Kazuma Kobayashi Koji Inaba Naoya Murakami Jun Itami

The brachytherapy dose calculations used in treatment planning systems (TPSs) have conventionally been performed assuming homogeneous water. Using measurements and a Monte Carlo simulation, we evaluated the dosimetric impact of an air passage on brachytherapy for bronchus cancer. To obtain the geometrical characteristics of an air passage, we analyzed the anatomical information from CT images o...

Journal: :iranian journal of medical physics 0
mehdi zehtabian ray medical engineering department, school of mechanical engineering, shiraz university, shiraz iran elham piruzan ray medical engineering department, school of mechanical engineering, shiraz university, shiraz iran zahra molaiemanesh ray medical engineering department, school of mechanical engineering, shiraz university, shiraz iran

introduction lead-based shields are the most widely used attenuators in x-ray and gamma ray fields. the heavy weight, toxicity and corrosion of lead have led researchers towards the development of non-lead shields. materials and methods the purpose of this study was to design multi-layered shields for protection against x-rays and gamma rays in diagnostic radiology and nuclear medicine. in this...

Journal: :iranian journal of medical physics 0
banafsheh zeinali rafsanjani m.sc. of nuclear engineering, medical radiation trends, faculty of mechanical engineering, shiraz university, shiraz, iran. reza faghihi assistant professor of medical radiation, radiation research center, faculty of mechanical engineering, shiraz university, shiraz, iran.

introduction: among different kinds of oral cavity cancers, the frequency of tongue cancer occurrence is more significant. brachytherapy is the most common method to cure tongue cancers. long sources are used in different techniques of tongue brachytherapy. the objective of this study is to asses the dose distribution around long sources, comparing different radioisotopes as brachytherapy sourc...

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