نتایج جستجو برای: mcnp4c
تعداد نتایج: 205 فیلتر نتایج به سال:
Background: Iodine brachytherapy sources with low photon energies have been widely used in treating cancerous tumors. Dosimetric parameters of brachytherapy sources should be determined according to AAPM TG-43U1 recommendations before clinical use. Monte Carlo codes are reliable tools in calculation of these parameters for brachytherapy sources. Materials and Methods: Dosimetric param...
روش تصویربرداری pet (تصویربرداری گسیل پوزیترون) یکی از روشهای نوین تصویربرداری به صورت مقطعی (برش نگاری) است، که امروز به صورت گسترده ای در سطح جهان استفاده می شود. مزیت این روش، تصویربرداری از عملکرد و فیزیولوژی، بافتهای بدن است. در این روش دارو با یک رادیونوکلئید تابش کننده پوزیترون نشان دار شده و به بدن تزریق می گردد. بسته به خصوصیات ویژه دارو، این ماده در بخشی از بدن بیمار مجتمع می گردد. در...
Introduction In order to treat uveal Melanoma , first, radioactive seeds are laid on a silicone- made substance which is called Silastic after that they are inserted in the plaque, and finally, this plaque containing silicone-made substance is stitched to the sclera surface. The dose gradient within the tumor and healthy tissues can be varied due to changing the Silastic thickness between scler...
Background: The formalism recommended by Task Group 60 (TG-60) of the American Association of Physicists in Medicine (AAPM) is applicable for β sources. Radioactive biocompatible and biodegradable 153Sm glass seed without encapsulation is a β- emitter with a short half life and delivers a high dose rate to the tumor in the millimeter range. In this work the dosimetry parameters of the ...
In regard with increasing use of brachytherapy for treatment of cancer, especially prostate cancer, dosimetry of the organs surrounding prostate is necessary. The received dose by prostate is relatively high and the healthy organs surrounding prostate are potentially at a risk of high dose too. In this paper, the doses delivered to the prostate and organs of interest were calculated by MCNP4C c...
Introduction: 103Pd is a low energy source, which is used in brachytherapy. According to the standards of American Association of Physicists in Medicine, dosimetric parameters determination of brachytherapy sources before the clinical application was considered significantly important. Therfore, the present study aimed to compare the dosimetric parameters of the target source using the water ph...
آهنگ دز یکی از پارامترهای مهم در کنترل پرتوگیری شغلی و کنترل پرتوگیری عامه‌ی مردم در نتیجه‌ی حمل و نقل، انبارداری و کار با مواد پرتوزا است (یکی از مواد پرتوزای مورد استفاده در صنعت غنی‌سازی هگزافلورید اورانیم است که برای نگه‌داری و جابه‌جایی آن از مخازن مخصوصی از جنس کربن استیل استفاده می‌شود). در این کار پژوهشی، آهنگ دز جذبی از پرتوهای گسیلیده از سیلندر مدل 30B محتوی 6UF طبیعی توسط ...
Introduction: One of the important problems of using high energy linacs is the production of photoneutrons. High energy medical linacs produce secondary neutrons. These phtoneutrons increase patient dose Materials and Methods: In this study, the effect of plastic trays on spectrum of photoneutrons produced by 18MV linac is investigated using the MCNP4C code...
Several updated Monte Carlo (MC) codes are available to perform calculations of voxel S values for radionuclide targeted therapy. The aim of this work is to analyze the differences in the calculations obtained by different MC codes and their impact on absorbed dose evaluations performed by voxel dosimetry. Voxel S values for monoenergetic sources (electrons and photons) and different radionucli...
background: monte carlo and experimental relative dose determination in a water phantom, due to a high dose rate (hdr) 192ir source is presented for real energy spectrum and monochromatic at 356 kev. materials and methods: the dose distribution has been calculated around the 192ir located in the center of 30 cm ×30 cm ×30 cm water phantom using mcnp4c code by monte carlo method. relative dose v...
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