نتایج جستجو برای: mcnp 4c
تعداد نتایج: 4108 فیلتر نتایج به سال:
ABSTRACT Background: accurate methods of radiation therapy dose calculation. There are different Monte Carlo codesfor simulation of photons, electrons and the coupled transport of electrons and photons. MCNPis a general purpose Monte Carlo code that can be used for electron, photon and coupledphoton-electron transport.Monte Carlo simulation of radiation transport is considered to be one of the ...
BACKGROUND Obtaining high quality images in Single Photon Emission Tomography (SPECT) device is the most important goal in nuclear medicine. Because if image quality is low, the possibility of making a mistake in diagnosing and treating the patient will rise. Studying effective factors in spatial resolution of imaging systems is thus deemed to be vital. One of the most important factors in SPE...
Dual-energy mammographic imaging experimental tests have been performed using a compact dichromatic imaging system based on a conventional x-ray tube, a mosaic crystal, and a 384-strip silicon detector equipped with full-custom electronics with single photon counting capability. For simulating mammal tissue, a three-component phantom, made of Plexiglass, polyethylene, and water, has been used. ...
Introduction: With the extensive application of radiation sources and radioactive materials in various fields, the study of attenuation and absorption of X-rays and gamma-rays in several materials has become an essential and interesting field of research. Glass materials are possible alternatives of concretes for radiation-shielding materials. Materials and Methods:...
در این پایان نامه تعیین درجه خلوص آب سنگین با استفاده از شبیه سازی یک کند کننده وهم خط سازنوترون توسط کدmcnp 4c و واکنش (_1^2)h(?n,) (_1^1)h صورت گرفته است. به این منظور ابتدا اقدام به شبیه سازی یک کند کننده وهم خط ساز نوترون با چشمهam-be نموده ایم. این کند کننده نقش بسیار مهمی در تولید نوترون های حرارتی دارد. هر چه انرژی نوترون حرارتی بیشتر باشد سطح مقطع جذب نوترون کمتر است. یک کند کننده نوترو...
MCNP is widely used Monte Carlo program in reactor and nuclear physics. However, an option of simulating electrons was added into the code a few years ago. With this extension MCNP became a code, potentially applicable for applications in medical physics. In 1997, a new version of the code, named MCNP4B was released, which contains several improvements in electron transport modelling. To test s...
رادیودارویfdg(18-fluoro-deoxy-glucose) از طریق واکنشh218o(p,n)18f و گذراندن فرآیند شیمیایی، با استفاده ازپروتونهای با انرژی mev17حاصل از شتابدهنده سیکلوترون cyclone30در پژوهشگاه علوم و فنون هستهای تولید میشود. شدت نوترونهای تولیدی در این واکنش و محاسبه طیف آنها به لحاظ ایمنی و به منظور بررسی حفاظ پرتوها ضروری است. در این مقاله با بهرهگیری از کدهای کامپیوتری srim 2003 و alice و نیز استفاده...
abstractbackground: an electron beam generated x-ray spectrum consists of characteristic x-ray and continuous bermsstrahlung. the aim of this research is calculating and comparing x-ray spectra for different target filter of mammograms. materials and methods: monte carlo is a very powerful tool to simulate a series of different target-filter assembly in order to calculate the x-ray spectra. mcn...
In this paper, we show that concentrations of manufactured carbon-based nanoparticles (MCNPs) in aquatic sediments will be negligible compared to levels of black carbon nanoparticles (BCNPs). This is concluded from model calculations accounting for MCNP sedimentation fluxes, removal rates due to aggregation or degradation, and MCNP burial in deeper sediment layers. The resultant steady state MC...
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