نتایج جستجو برای: medical linear accelerators
تعداد نتایج: 1066062 فیلتر نتایج به سال:
Proton and heavy ion accelerators of the medial energy are very important in science and technology. First of all in the medicine, in the field of elimination of nuclear waste, for the creation safe subscritical reactors and so on. Their usage will help to cure cancer, to develop safety nuclear energetic, to protect environment and so on. Unfortunately large size of the accelerators that could ...
Very high energy electrons (VHEE) in the range from 100-250 MeV have the potential of becoming an alternative modality in radiotherapy because of their improved dosimetry properties compared with MV photons from contemporary medical linear accelerators. Due to the need for accurate dosimetry of small field size VHEE beams we have performed dose measurements using EBT2 Gafchromic® film. Calibrat...
The demand on high stability and precision on the RF voltage for modern accelerators, as well as better diagnostics, maintenance and flexibility is driving the community to develop Digital Low Level RF systems (DLLRF) for both linear accelerators and synchrotrons. The state of the art in digital technologies applied to DLLRF systems is reviewed; different designs developed or in development at ...
High-power free electron lasers (FEL’s) can be realized using induction linear accelerators as the source of the electron beam. These accelerators are currently capable of producing intense cwrents (102-104 A) at moderately high energy (1-50 MeV). Experiments using a 500 A, 3.3 MeV beam have produced 80 MW of radiation at 34.6 GHz and are in good agreement with theoretical analysis. Future expe...
The yield of bremsstrahlung (BS) from collisions of fast electrons (energy at least 6 MeV) with a Tungsten target can be significantly improved by exploitation of Tungsten wall scatter in a multi-layered target. A simplified version of a previously developed principle is also able to focus on small angle scattered electrons by a Tungsten wall. It is necessary that the thickness of each Tungsten...
the purpose of this study was to examine the english language needs of medical students at tehran university of medical sciences . analysis of the needs took place for three groups: 320 undergraduate students, 30 postgraduate students and 20 university instructors. a triangulation approach to collect data was used in which a combination of the quantitative (using the questionnaires) and qualita...
پژوهش حاضر به روش توصیفی و با هدف تحلیل استنادی ماخذ مقالات نشریات علوم پزشکی انگلیسی زبان ایران و تعیین میزان دسترسی رایگان به متن کامل مجلات استناد شده در آنها از طریق سایتهای اینترنت انجام گرفته است. جامعه پژوهش شامل کل استنادهای مقالات دوره 2000 سه نشریه medical journal ، iranian journal of medical sciences، acta medica iranica of islsmic republic of iran بوده که این مجلات دارای...
background: monte carlo (mc) modeling of a linear accelerator is a prerequisite for monte carlo dose calculations in external beam radiotherapy. in this study, a simple and efficient model was developed for elekta sl-25 linear accelerator using mcnp4c monte carlo code materials and methods: the head of elekta sl-25 linac was simulated for 6 and 18 mv photon beams using mcnp4c mc code. energy sp...
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