نتایج جستجو برای: electron beam

تعداد نتایج: 401340  

Journal: :iranian journal of medical physics 0
mohamad javad tahmasebi-birgani department of medical physics, jundishapuruniversity of medical sciences, ahvaz, iran mohamad reza bayatiani radiotherapy and medical physics department of arak university of medical sciences&khansari hospital, arak, iran fatemeh seif radiotherapy and medical physics department of arak university of medical sciences&khansari hospital, arak, iran mansur zabihzadeh department of medical physics, jundishapuruniversity of medical sciences, ahvaz, iran hojatolah shahbazian department of medical physics, jundishapuruniversity of medical sciences, ahvaz, iran

introduction magnetic fields are capable of altering the trajectory of electron beams andcan be used in radiation therapy.theaim of this study was to produce regions with dose enhancement and reduction in the medium. materials and methods the ndfeb permanent magnets were arranged on the electron applicator in several configurations. then, after the passage of the electron beams (9 and 15 mev va...

Journal: :journal of biomedical physics and engineering 0
f felfeliyan department of medical physics, school of medicine, isfahan university of medical sciences, isfahan, iran m atarod department of medical physics and radiology, shahrekord university of medical sciences, shahrekord, iran a amouheidari department of radiation oncology, milad hospital, isfahan, iran s noshadi department of medical physics, school of medicine, isfahan university of medical sciences, isfahan, iran p shokrani department of medical physics, school of medicine, isfahan university of medical sciences, isfahan, iran

background: field matching problems in abutting electron fields can be managed by using spoilers. objective: the aim of this study was to design a monte carlo framework for the assessment of spoiler application in abutting electron fields. methods: a siemens primus treatment head was simulated for a 5 mev electron beam using beamnrc and dosxyznrc, egsnrc user codes. validation of beam model was...

Journal: :polyolefins journal 2015
jalil morshedian yousef jahani farshad sharbafian foroogh zarei

hdpe monofilaments were obtained using different extruders and drawn by post-extruder equipments. after solidification, drawn and undrawn monofilaments (draw ratio 7:1) were irradiated with 10 mev electron beams in air at room temperature at 25, 50, 75, 100 and 125 kgy dose ranges to induce a network structure. hdpe crosslinking was studied on the basis of gel content measurements. the fibers w...

Journal: :iranian journal of medical physics 0
zahra anjomani m.sc. in medical physics, nuclear engineering dept., shahid beheshti university, tehran, iran hasan nedaie assistant professor, radiotherapy physics dept., tehran university of medical science, tehran, iran majid shariari associate professor, nuclear engineering dept, shahid beheshti university, tehran, iran

introduction: nowadays new radiochromic films have an essential role in radiotherapy dosimetry. properties such as high sensitivity, good reproducibility, high spatial resolution, easy readout and portability have made them attractive for dosimetry, especially in high-dose-gradient regions. material and methods: in this study, electron-beam dose distributions in homogenous and heterogeneous pha...

Journal: :journal of advanced materials and processing 0
mohamad javad eshraghi materials and energy research center nima naderi materials and energy research center

the effect of evaporation rate on structural, morphological and optical properties of electron beam evaporated cds thin films have been investigated. cds thin film deposited by electron beam evaporation method in 12nm/min and 60nm/min evaporation rates on glass substrates. x-ray diffraction, scanning electron microscopy, uv-vis-nir spectroscopy and atomic force microscopy were used to character...

Journal: :journal of the iranian chemical research 0
nooredin goodarzian chemistry department, islamic azad university, shiraz branch, shiraz, iran mohammad amin shamekhi polymer engineering department, islamic azad university, sarvestan branch, sarvestan, iran

cross linking of high density polyethylene (hdpe) was first performed via high energy10 mev electron beam (eb) irradiation. hdpe was also cross linked withdicumyle peroxide (dcp).the gel content of samples was determined by solvent extraction.degree of cross linking was evaluated by hot set apparatus; as well .in order to clarify the effectof nature of cross linking, correlation of electrical p...

Journal: :iranian journal of applied animal science 2015
s. yakhkeshi s. rahimi p. shawrang

a total of 300 one-day old male broilers (cobb 500) were randomly divided into four treatment groups. the groups comprised of 15 birds each, and were defined by diet and the birds in each group were fed 0 (control), 3, 5, or 7 kgy electron-beam irradiated diets. a total of 5 replicates were performed. the chemical composition of the diet was not affected by irradiation.irradiation doses of 5 an...

صادقی‌پناه, آرش, عباسی‌دوانی, فریدون,

Electrostatic focusing lenses have a vast field of applications in electrostatic accelerators and particularly in electron guns. In this paper, we first express a parametric mathematical analysis of an electrostatic accelerator and focusing system for an electron beam. Next, we At design a system of electron emission slit, accelerating electrodes and focusing lens for an electron beam emitted f...

Journal: :journal of paramedical sciences 0
danial seifi makrani department of medical physics, faculty of medical sciences, semnan university of medical sciences, semnan, iran hadi hasanzadeh cancer research center, department of medical physics, semnan university of medical sciences, semnan, iran tayyeb allahverdi pourfallah department of biochemistry and biophysics, faculty of medicine, mazandaran university of medical sciences, sari, iran arash ghasemi department of radiology and radiation oncology, faculty of medicine, mazandaran university of medical sciences, sari, iran majid jadidi department of medical physics, faculty of medical sciences, semnan university of medical sciences, semnan, iran hamed babapour guilan oncology center (goc), rasht, iran

the monte carlo method can be used to describe any technique that approximates solutions to quantitative problems through statistical sampling. this method is considered to be the most accurate method for dose calculation in radiotherapy. for complete modeling of a linear accelerator, it is required that the manufactured information covers all data, but some data such as primary electron energy...

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