نتایج جستجو برای: mcnp 4c code

تعداد نتایج: 171417  

2012
Fatemeh Sadat Rasouli Seyed Farhad Masoudi

Introduction BNCT is an effective method to destroy brain tumoral cells while sparing the healthy tissues. The recommended flux for epithermal neutrons is 10 n/cms, which has the most effectiveness on deep-seated tumors. In this paper, it is indicated that using D-T neutron source and optimizing of Beam Shaping Assembly (BSA) leads to treating brain tumors in a reasonable time where all IAEA re...

2004
F. Palacios V. M. Hernández-Dávila R. Méndez M. P. Iñiguez R. Barquero E. Manzanares-Acuña H. R. Vega-Carrillo

An artificial neural network has been designed to obtain the neutron spectra from the Bonner spheres spectrometer's count rates. The neural network was trained using 101 neutron spectra taken from IAEA's compilations. These include calibration, reference and operational neutron spectra whose energy distribution is different from UTA4 response matrix, therefore the spectra were converted from le...

Journal: :iranian journal of radiation research 0
t.p. faez physical oceanography department, azad university, tehran, iran s. sarkar department of medical physics, tehran university of medical sciences, tehran, iran

abstract

انتظار مهدی, محمد, خم خاجی, جمال, قدیری, حسین , مجرد کاهانی, محمد مهدی , هاشمی, سمانه, کمالی اصل, علیرضا ,

Background and purpose: Dual-energy mammography is a technique which is used to enhance the accuracy of breast cancer diagnosis especially in dense breasts. This study was conducted based on the simultaneous use of two contrast agents for automatic separation and also to evaluate their accuracy using dual-energy digital mammography. Materials and methods: A breast phantom was designed and b...

2015
Tran Van Hung

---------------------------------------------------------------------***--------------------------------------------------------------------Abstract The dose distribution in irradiation room and the dose rate at each dwell position of 60Co irradiator SVST-Co-60/B have been calculated using MCNP code. The calculated results are useful information to estimate radiation safety and design irradiato...

Alireza Karimian, Arman Rahmim Mahdi Nasri Nasrabadi Nematollah Ahmadi Jeshvaghane

Introduction: The CT machine utilizes a bowtie filter to shape the X-ray beam and remove lower energy photons. Configuration of this bowtie filter is complex and its geometry is often not available in detail. It causes the CT dose index (CTDI) be with the different values in measurement versus Monte Carlo simulation studies and other analytical calculations. It is important esp...

Journal: :journal of medical signals and sensors 0
daryoush shahbazi-gahrouei saba ayat

introduction: radioiodine therapy is an effective method for treating thyroid cancer carcinoma, but it has some affects on normal tissues, hence dosimetry of vital organs are important to weigh the risks and benefits of this method. the aim of this study is to measure the absorbed doses of important organs by mcnp (monte carlo n particle) simulation and comparing the results of different method...

کمالی اصل, علیرضا , قدیری, حسین, مجرد کاهانی, محمد مهدی, هاشمی, سمانه,

Background and purpose: Dual-energy mammography technique is used for improving the accuracy of breast cancer diagnosis especially in dense breast cases and also detection of micro-calcifications which are early signs of breast cancer. The purpose of this study was to investigate the automatic separation feasibility of micro-calcification images in breast tissue images and evaluating its accura...

Mehdi Momen Nezhad Mohammad Taghi Bahreyni Toossi, Seyed Mohammad Hashemi

Introduction: In recent decades, several Monte Carlo codes have been introduced for research and medical applications. These methods provide both accurate and detailed calculation of particle transport from linear accelerators. The main drawback of Monte Carlo techniques is the extremely long computing time that is required in order to obtain a dose distribution with good statistical accuracy. ...

D. Rezaei Ochbelagh, H. Miri Hakimabad, R. Izadi Najafabadi,

Background: Several landmine detection methods, based on nuclear techniques, have been suggested during the recent years. Neutron energy moderation, neutron-induced gamma emission, neutron and gamma attenuation, and fast neutron backscattering are nuclear-based methods used for landmine detection. The aim of this study is to use backscattered neutron for landmine detection. Materials ...

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