نتایج جستجو برای: mcnp 4c code

تعداد نتایج: 171417  

2015
Amaal A. Tawfik Moustafa Aziz

The dose distribution inside the Gamma Cobalt irradiation therapy unit at Egyptian Atomic Energy Authority (EAEA) was determined both experimentally and theoretically. MCNP computer code, based on Monte Carlo method, was used to model the unit and calculate the dose distributions in both normal and emergency situation of the unit. The dose distribution inside the unit was also measured during t...

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 S...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد 1390

چکیده یکی از دغدغه‎های اصلی جوامع بشری سوانح هسته‎ای و پرتوگیری خارجی از ایزوتوپ‎های آزاد شده از آن می‎باشد. از این رو، تعیین انرژی ذخیره شده توسط مواد پرتوزا در بدن انسان ضروری است. علمی که به کمک آن می توان به این مهم دست یافت دزسنجی نام دارد و هدف آن محاسبه دز موثر می‎باشد. برای این منظور، دو روش متفاوت حل مسئله مطرح می‎شود: روش تحلیلی و روش عددی. در روش تحلیلی با توجه به خطای سیستماتیک، ب...

2002
Hugo Moura Dalle Francisco J. Muniz

Procedures and results obtained in the installation process of a microcomputers cluster (Linux and PVM) to reduce processing time in MCNP simulations are described. The necessities and specificity concerned to the hardware, the Linux operational system, the PVM software package and an adequated compiled version for MCNP4B are presented. The system was tested to verify the gain in the processing...

1999
N. A. Hanan A. P. Olson R. B. Pond J. E. Matos

The REBUS-3 burnup code, used in the ANL RERTR Program, is a very general code that uses diffusion theory (DIF3D) to obtain the fluxes required for reactor burnup analyses. Diffusion theory works well for most reactors. However, to include the effects of exact geometry and strong absorbers that are difficult to model using diffusion theory, a Monte Carlo method is required. MCNP, “a general-pur...

Journal: :journal of biomedical physics and engineering 0
s. banari bahnamiri phd student of nuclear physics, department of physics, faculty of science, ferdowsi university of mashhad, mashhad, iran s. h. miri hakimabad professor of nuclear physics, department of physics, faculty of science, ferdowsi university of mashhad, mashhad, iran r. izadi najafabadi associate professor of nuclear physics, department of physics, faculty of science, ferdowsi university of mashhad, mashhad, iran

background: the potential hazards of exposure to radiation from radon have been of great concern worldwide, as it is associated with an increased risk of lung cancer. radon (222rn) and its progeny are the main sources of radioactivity in the environment. the half-life of 222rn (3.82 days) is long enough for it to diffuse into and build up in homes. 220rn or thoron from the 232th series, and 219...

Journal: :iranian journal of radiation research 0
a.a. mowlavi department of physics, tarbiat moallem university of sabzevar, p.o. box 397, sabzevar, iran a. binesh department of physics, payam nour university of fariman, fariman, iran h. moslehitabar department of physics, payam nour university of mashhad, mashhad, iran

background: palladium-103 (103pd) is a brachytherapy source for cancer treatment. the monte carlo codes are usually applied for dose distribution and effect of shieldings. monte carlo calculation of dose distribution in water phantom due to a med3633 103pd source is presented in this work. materials and methods: the dose distribution around the 103pd model med3633 located in the center of 30×30...

حسین آفریده, , رحیم کوهی فائق, , رضا ایزدی نجف‌آبادی, ,

  In the experimental section of this project, the energy spectrum of fast neutrons is measured, after being passed through large blocks, approximately lm3 each, of graphite, aluminium, water and paraffin. Neutrons were produced via 7Li(p,n)7Be reaction by bombarding a Lithium target with 25 or 30 MeV protons of the cyclotron at the Nuclear Research Centre for Agriculture and Medicine in Karaj....

Journal: :journal of paramedical sciences 0
jamal amiri faculty of paramedicine, science, ilam university of medical science, ilam, iran seyed pezhman shirmardi nuclear science and technology research institute (nstri), tehran, iran rohollah adeli nuclear science and technology research institute (nstri), tehran, iran mostafa erfani nuclear science and technology research institute (nstri), tehran, iran elham saniei faculty of physics, amirkabir university of technology, tehran, iran reza vafaee proteomics research center, shahid beheshti university of medical sciences, tehran, iran

chlorotoxin is a 36 amino acids peptide, which is able to block chloride channels isolated from mouse brain. a derivative of chlorotoxin is synthesized and it is labeled by iodine 131; then animal experiments carry out on rats. multiple organ doses may be calculated with biological distribution results in rats with labeled compounds using simulated mcnp4c code. human dose can be calculated usin...

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