نتایج جستجو برای: geant4 dna
تعداد نتایج: 508519 فیلتر نتایج به سال:
Geant4 is a toolkit for the simulation of the passage of particles through matter, developed with advanced software engineering techniques. Its application areas include high energy and nuclear physics experiments, space physics, medical physics and radiation background studies.
The spatial distribution of energy deposition events is an essential aspect in the determination radiobiological effects ionizing radiation at cellular level. Microdosimetry provides a theoretical framework for description these events, and has been used several studies to address problems such as characterization Linear Energy Transfer (LET) Relative Biological Effectiveness (RBE) ion beams pr...
Background & Aim: PET is a very useful and suitable imaging method in nuclear medicine. This method uses positrons with a special energy for imaging. The elements of the lanthanide are suitable for the decay of positrons with a specific energy for use in PET. Praseodymium-139 with a half-life of 4.5 hours is one of the useful elements in the group of lanthanides that can be used in PET. In this...
geant4 یک ابزار شبیه سازی آشکارساز می باشد که برای مطالعات در زمینه ی فیزیک پر انرژی، فیزیک هسته ای، فیزیک نجومی و فضایی، پزشکی و مطالعات پایه ای در زمینه ی تابش ها طراحی گردیده است. با استفاده از این ابزار می توان آزمایش های تجربی را شبیه سازی نمود و اعتبارسنجی این بسته را آزمود. در آزمایشی که به منظور اعتبارسنجی مدل های الکترومغناطیسی geant4 در این پایان نامه انتخاب شده از یک آشکارساز برای...
in this study, a general theoretical model to foresee and calculate the current-voltagecharacteristics in a plateau zone and the associated efficiency of the neutron detector (sensitivity) is presented. this study is to complete the previous studies in this field. the model also considers electric field distortion resulting from the charge collection effect. the characteristics curve is obtaine...
This study proposes a method to estimate RBE of fast neutrons using Monte Carlo simulations. This approach is based on the combination of an atomic resolution DNA geometrical model and Monte Carlo simulations for tracking particles. Atomic positions were extracted from the Protein Data Bank. The GEANT4 code was used for tracking the secondary particles generated by fast neutrons during their in...
The biological damages are mainly produced by direct ionization and excitation of bio-molecular DNA electrons or by indirect chemical reaction of water radiolysis products with DNA. In this work, we restricted our study on the interaction of energetic ion proton beams with liquid water; since the water represents over 80% of the most-soft tissues. The proton collisions with water molecules are ...
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