نتایج جستجو برای: electron mode

تعداد نتایج: 522741  

اکبر پروازیان, , مرتضی حسین پور, ,

Magnetically confined plasma can be heated with high power microwave sources. In spherical torus the electron plasma frequency exeeds the electron cyclotron frequency (EC) and, as a consequence, electromagnetic waves at fundamental and low harmonic EC cannot propagate within the plasma. In contrast, electron Bernstein waves (EBWs) readily propagate in spherical torus plasma and are absorbed str...

Journal: :journal of biomedical physics and engineering 0
m ghorbani medical physics department, faculty of medicine, mashhad university of medical sciences, mashhad, iran z s tabatabaei medical physics department, faculty of medicine, mashhad university of medical sciences, mashhad, iran a vejdani noghreiyan medical physics department, faculty of medicine, mashhad university of medical sciences, mashhad, iran h vosoughi medical physics department, faculty of medicine, mashhad university of medical sciences, mashhad, iran c knaup comprehensive cancer centers of nevada, las vegas, nevada, usa

objective: the aim of this study is to evaluate the effect of tissue composition on dose distribution in electron beam radiotherapy. methods : a siemens primus linear accelerator and a phantom were simulated using mcnpx monte carlo code. in a homogeneous cylindrical phantom, six types of soft tissue and three types of tissue-equivalent materials were investigated. the tissues included muscle (s...

2001
A. K. Ram A. Bers C. N. Lashmore-Davies

it has been shown that, in overdense plasmas of the type encountered in spherical tori, electron Bernstein waves can be excited in a plasma by mode conversion of either an externally launched X mode or an O mode. The electron Bernstein waves are strongly absorbed by electrons in the region where the wave frequency matches the Doppler broadened electron cyclotron resonance frequency or its harmo...

Journal: :The Journal of Physical Chemistry B 2014

Journal: :iranian journal of medical physics 0
hadis ansari mehr1 department of medical radiation engineering, science and research branch, islamic azad university, tehran, iran

introduction the use of cut-outs in electron applicators make changes on output, isodose, and percentage depth dose (pdd) curves. these changes and electron beam dose distribution in the form of three-dimensional (3d) can be measured by gel dosimeters. materials and methods dosimetry was performed with and without a square shield (6×6 cm2 field). the energies were 4, 9, and 16 mev and phantom w...

Background: Neutron contamination is produced in electron beams of linac when tooth or dental materials are located in the path of beam. Objective: This study aims to determine the neutron dose contamination from different dental restoration materials in electron mode of a linac. Material and Methods: In this experimental study, the neutron dose contamination was calculated in the p...

Journal: :Physica E: Low-dimensional Systems and Nanostructures 2018

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