نتایج جستجو برای: mcnp 4c code

تعداد نتایج: 171417  

رنجبر, لیلا, شهابی, ایرج, شیرانی, احمد,

In this work, the Isfahan Miniature Neutron Source Reactor (MNSR) is first simulated using the WIMSD code, and its fuel burn-up after 7 years of operation ( when the reactor was revived by adding a 1.5 mm thick beryllium shim plate to the top of its core) and also after 14 years of operation (total operation time of the reactor) is calculated. The reactor is then simulated using the MCNP code,...

2007
Shaun Clarke Thomas Downar Sara Pozzi Marek Flaska John Mihalczo Enrico Padovani Alan Hunt

This work illustrates a methodology based on photon interrogation and coincidence counting for determining the characteristics of fissile material. The feasibility of the proposed methods was demonstrated using the Monte Carlo-based MCNPX/MCNPPoliMi code system capable of simulating the full statistics of the neutron and photon field generated by the photon interrogation of fissile and non-fiss...

2006
Ivan Maldonado Zhongxiang Zhao

The MCNP code is a general Monte Carlo N-Particle Transport program that is widely used in health physics, medical physics and nuclear engineering for problems involving neutron, photon and electron transport. However, due to the stochastic nature of the algorithms employed to solve the Boltzmann transport equation, MCNP generally exhibits a slow rate of convergence. In fact, engineers and scie...

Journal: :Nuclear Engineering and Technology 2021

Gamma radiation shielding features for three series of binary alloys identified as (Pb–Sn), (Pb–Zn), and (Zn–Sn) have been investigated. The mass attenuation coefficients (?/?) the selected were simulated using MCNP-5 code in energy range between 0.01 15 MeV. Moreover, values computed WinXCOM database same to validate simulation results. Results reveal a good agreement values. half value layer ...

Journal: :Epj Web of Conferences 2021

Since 2005 the nodal diffusion based code system, OSCAR-3, was used for reactor support calculations of operational cycles High Flux Reactor in Petten, The Netherlands. OSCAR uses a two-step deterministic calculation, which homogenized cross sections are generated lattice environments using neutron transport simulations, and then passed to core simulator model full reactor. Limitations OSCAR-3 ...

2010
R. Khan

The 250kW TRIGA Mark II research reactor, Vienna, is equipped with experimental facilities inside and outside the reactor core. Outside the core, there are four beam tubes (three radial and one tangential beam tube), a thermal column and a neutron radiography collimator, supplying neutrons for irradiation experiments. These experiments include neutron radiography, neutron tomography, neutron ac...

2003
H. Koivunoro T. P. Lou J. Reijonen K-N Leung

Boron-neutron capture therapy (BNCT) is an experimental radiation treatment modality used for highly malignant tumor treatments. Prior to irradiation with low energetic neutrons, a B compound is located selectively in the tumor cells. The effect of the treatment is based on the high LET radiation released in the B(n,α)Li reaction with thermal neutrons. BNCT has been used experimentally for brai...

Journal: :iranian journal of radiation research 0
a. mostaar medical physics department, tehran university of medical sciences, tehran, iran m. allahverdi department of radiotherapy physics, cancer institute, tehran, iran m. shahriari gamma irradiation center, atomic energy organization of iran, tehran, iran

background: in treating patients with radiation, the degree of accuracy for the delivery of tumor dose is recommended to be within ± 5% by icru in report 24. the experimental studies have shown that the presence of low-density inhomogeneity in areas such as the lung can lead to a greater than 30% change in the water dose data. therefore, inhomogeneity corrections should be used in treatment pla...

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