یکی از پارامترهای مهم محیط­های پخش نوترون، طول نوترون حرارتی است. روش مرسوم محاسباتی استفاده کد MCNP برمبنای توزیع شار در محیط و برازش تابع ریاضی مربوطه بر آن این پژوهش، روشی نوین که مبنای کارت PTRAC است، ارایه شده پارامتر برای آب­سبک اساس روش­های فوق محاسبه با مقادیر گزارش مراجع مقایسه گردیده تطابق خوبی نیز مشاهده حسن فوق، عدم نیاز به علاوه فرض می­شود تا محل چشمه، فاصله­ی کافی وجود دارد. مسأله...

The electron beam from the linear accelerator is of size ~ 2 mm, whereas the size of the electron beam profile required for actual treatment is usually larger than 2 2 cm up to 30 30 cm at the iso-center. Therefore, scattering foils were optimized and simulated using FLUKA code. The primar scattering foil as kept niform thickness y w u , whereas the secondary foil was of Gaussian shape with var...

This paper presents dose calculation in proton therapy using Monte Carlo method and comparison with experimental data obtained at TOHOKU University’s cyclotron and isotope center in Japan. In this way, two Monte Carlo codes, FLUKA and MCNPX, has been employed to calculate percentage depth dose, lateral dose profiles, isodose curves and secondary particles production for proton pencil and broad ...

Experiments measuring cosmic rays above an energy of ∼ 10 eV deduce the energy and mass of the primary cosmic ray particles from air-shower simulations. We investigate the importance of hadronic interactions at low and high energies on the distributions of muons and electrons in showers on ground. In air shower simulation programs, hadronic interactions below an energy threshold in the range fr...

Primary GCR interact with the Earth’s atmosphere originating atmospheric showers, thus giving rise to fluxes of secondary particles in the atmosphere. Electromagnetic and hadronic interactions interplay in the production of these particles, whose detection is performed by means of complementary techniques in different energy ranges and at different depths in the atmosphere, down to the Earth’s ...

This study investigates the characteristics of prompt radiation field and some issues of induced activities due to the operation of the Taiwan Photon Source (TPS). Starting from assumed beam loss scenarios and using the FLUKA Monte Carlo simulations, energy spectra and dose distributions of the prompt radiation field for its shielding design were studied. Radiation environment around the penetr...

The Linac Coherent Light Source (LCLS), a pioneer hard x-ray free electron laser is currently under construction at the Stanford Linear Accelerator Center. It is expected that by 2009 LCLS will deliver laser pulses of unprecedented brightness and short length, which will be used in several forefront research applications. This ambitious project encompasses major design challenges to the radiati...

We report on a comparison study of the Monte Carlo packages GEANT4 and FLUKA for simulating neutron production by muons penetrating deep underground. GEANT4 is found to generate fewer neutrons at muon energies above ∼100 GeV, by at most a factor of 2 in some materials, which we attribute mainly to lower neutron production in hadronic cascades. As a practical case study, the muon-induced neutron...

Introduction Shielding calculations for the GSI future project [1] have been performed using the radiation transport code FLUKA [2, 3]. FLUKA is capable of simulating hadronic and electro-magnetic interactions of particles with matter. Here the task is to attenuate radiation generated inside experimental areas or accelerators to a dose rate not larger than 0.5μSv/h at outer walls and to estimat...

In 2014 a new vertical flight path was installed at the neutron time-of-flight facility, n TOF, at CERN. The beam line optimization of this second experimental area (EAR2) was performed by FLUKA simulations with a detailed model of the facility, including the spallation target, neutron beam line, magnet, collimators and beam dump. The beam profile as well as neutron and gamma fluxes were calcul...