نتایج جستجو برای: 6 mev electron beam

تعداد نتایج: 1335450  

1999
L. Habash Krause L. Habash B. E. Gilchrist

Two methods of passive remote sensing of mildly (E 5 MeV) relativistic electron beams as they propagate through the Earth’s upper and middle atmosphere are presented. Utilization of bremsstrahlung emissions as a diagnostic indicator of beam characteristic energy and particle flux is compared and contrasted with that of the optical emission technique. A new MeV aurora1 electron model has been de...

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...

1995
F. Kakimoto E. C. Loh M. Nagano H. Okuno M. Teshima S. Ueno

We measured the air uorescence yield as a function of pressure with electrons between 1.4 MeV and 1000 MeV by means of a 90 Sr source and an electron beam. Results indicate that the uorescence yield is proportional to electron energy loss from 1.4 MeV to 1000 MeV. The dE dx relativistic rise in air is detected. We describe the pressure temperature dependency of air uorescence by a formula deriv...

Azim Arbabi Bahram Bolouri Hasan Nedaie Ruhollah Ghahraman Asl

Introduction: Nowadays radiosensitive polymer gels are used as a reliable dosimetry tool for verification of 3D dose distributions. Special characteristics of these dosimeters have made them useful for verification of complex dose distributions in clinical situations. The aim of this work was to evaluate the capability of a normoxic polymer gel to determine electron dose distributions in differ...

Journal: :Medical physics 2012
M Lawless S Junell C Hammer L DeWerd

PURPOSE Thermoluminescent dosimeters are used routinely for dosimetric measurements of photon and electron fields. However, no work has been published characterizing TLDs for use in combined photon and electron fields. This work investigates the response of TLD-100 (LiF:Mg,Ti) in mixed fields of photon and electron beam qualities. METHODS TLDs were irradiated in a 6 MV photon beam, 6 MeV elec...

Journal: :Medical physics 2012
G Zhang K Javedan E Moros K Latifi V Feygelman H Lee Moffitt

PURPOSE Flattening filter free (FFF) beams in radiotherapy have advantages such as shorter treatment delivery time and lower out-of-field dose compared with conventional flattened beams. This study investigates in detail the skin dose induced by FFF beams from a TrueBeam accelerator (Varian Medical Systems, Palo Alto, CA) using Monte Carlo method. METHODS Phase space files generated using rea...

2000
S. Falabella

Using an induction linac, ETA-II, we are studying the interaction of a 2 kA, 6 MeV electron beam focused to a <2 mm diameter spot on high-Z foils. A focus shift was noticed when changing from 5 mil to 40 mil tantalum foil targets. This shift was subsequently attributed to the effect of a substantial fraction of the incident electron beam backscattering from the target, reducing the net beam cur...

2004
M. N. Martins J. Takahashi

The Laboratório do Acelerador Linear (LAL) of the Physics Institute of the University of São Paulo (IFUSP) is building a 31 MeV continuous wave (cw) racetrack microtron [1][2]. This two-stage microtron comprises a 1.8 MeV injector linac, a five-turn microtron booster that increases the energy to 4.9 MeV, and the main microtron, which delivers a 31 MeV cw electron beam after 28 turns. The inject...

Journal: :Physical review letters 2005
P Musumeci S Ya Tochitsky S Boucher C E Clayton A Doyuran R J England C Joshi C Pellegrini J E Ralph J B Rosenzweig C Sung S Tolmachev G Travish A A Varfolomeev A A Varfolomeev T Yarovoi R B Yoder

Energy gain of trapped electrons in excess of 20 MeV has been demonstrated in an inverse-free-electron-laser (IFEL) accelerator experiment. A 14.5 MeV electron beam is copropagated with a 400 GW CO2 laser beam in a 50 cm long undulator strongly tapered in period and field amplitude. The Rayleigh range of the laser, approximately 1.8 cm, is much shorter than the undulator length yielding a diffr...

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