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Showing 1 to 18 of 18 for “"Monte Carlo Radiation Transport"”.
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Encapsulated source contact dose estimates incorporating secondary electron emission
… to vary with material composition and incident radiation energies. The goal of this research effort is to estimate the emission strength from radioactive sources utilized in the early history of cancer Brachytherapy, and develop dose conversion factors from that data. Data was obtained by …
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Monte Carlo simulations of the iThemba LABS neutron beam facility
… in the measured neutron fluence spectra. The Monte Carlo radiation transport code FLUKA were used to study the effects of secondary neutrons on the neutron fluence spectra. Results obtained from the calculations were compared with those obtained experimentally.
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Computational aspects of treatment planning for neutron capture therapy
… is a biochemically targeted form of binary radiation therapy that has the potential to deliver radiation to cancers with cellular dose selectivity. Accurate and efficient treatment planning calculations are essential to maximizing the efficacy of BNCT and ensuring patient safety. This thesis …
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Numerical modeling study of a neutron depth profiling (NDP) system for the Missouri S&T reactor
… of experimental neutron flux measurements with Monte Carlo radiation transport calculations to simulate a proposed NDP-PIXE apparatus at MSTR. In addition, the possibility of implementing an Artificial Neural Network to perform automated data analysis of NDP is presented. It was found that the …
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Radiobiology of normal rat lung in Boron Neutron Capture Therapy
… Capture Therapy (BNCT) is a binary cancer radiation therapy that utilizes biochemical tumor cell targeting and provides a mixed field of high and low Linear Energy Transfer (LET) radiation with differing biological effectiveness. This project investigated the radiobiology of normal rat lung …
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Radiation shielding calculations by means of MCNPX
Monte Carlo radiation transport calculations were performed to re-evaluate the configuration of the horizontal target bombardment station of the ra-dionuclide production at iThemba LABS. Calculated neutron and photon dose attenuation factors for this shield were compared with those previously …
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Examination of secondary electrons generated by encapsulated gamma sources to improve contact dosimetry estimates
… of the encapsulation. The National Council on Radiation Protection and Measurements (NCRP) Report - 40 contains contact dose rate conversion factors for encapsulated gamma sources, along with recommended secondary electron correction factors. However, the secondary electron correction factors …
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Engineering design of a fission converter-based epithermal beam for neutron capture therapy
… position. The shutters were designed using the Monte Carlo radiation transport code MCNP. A medical irradiation room was designed for patient irradiation. The shielding computations for the medical room were also carried out with the MCNP. Fuel handling was investigated and proposed two options …
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Measuring cross-section data for prompt gammas emitted during proton-nucleus collisions
In Radiation Oncology, proton therapy has become an increasingly popular treatment modality due to the superior dose distribution of the proton beam while sparing more surrounding normal healthy tissues and critical organs. This advantage can quickly turn into a disadvantage if there is any …
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Towards measuring the relative biological effectiveness of high-energy neutrons at iThemba LABS
… through the interac-tions of primary cosmic radiation with matter such as in spacecraft shielding, and in the atmospheres and regoliths of moons and planets. The development of radiation health-risk models for space exploration requires the quantification of the biological effects of …
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Radiation Transport in Low Pressure Plasmas: Lighting and Semiconductor Etching Plasmas
Ultra-violet (UV) radiation is emitted by many molecular and atomic species in technological plasmas. In some products like lamps, the transport of radiation is an important design consideration. In other instances, such as semiconductor materials processing, the role of UV photons in surface …
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Requirements for the detection of atherosclerosis lesions in carotid arteries with SPECT
… of the neck using SimSPECT, our in-house analog Monte Carlo radiation transport code. We used 400 64x64 reconstructed images formed by 99mTc photons of a focal lesion in a carotid artery next to a jugular vein, both in a cylindrical water neck. We then applied the 3D \ mNPWMF along the large neck …
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X-ray Radiative Signatures Influenced by Nonthermal Effects in High-Energy-Density Laboratory Plasmas of Mid-Atomic-Number Z-pinches
… science. Spectroscopic examination of plasma radiation can yield robust information on plasma conditions such as, temperature, density, size, and elemental composition. Plasma radiation is an atomic fingerprint, providing insight into the diverse microphysics of the complex and intricate …
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General relativistic radiation magnetohydrodynamics, with applications to black hole accretion disks
… of accretion are set by angular momentum transport. A leading picture for this process has an instability of magnetic fields threading a differentially rotating fluid, the magnetorotational instability (MRI), driving turbulence that leads to diffusive angular momentum transport. The need …
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Development and characterization of a dual neutron and gamma detector
… tube to detect simultaneously gamma radiation as well as thermal neutrons. A compact data acquisition system has been used for neutron and gamma discrimination. The system has been tested with different gamma energies and with an Am-Be neutron source at the University of Ontario …
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Optimization of plastic scintillator thicknesses for online beta detection in mixed fields
… beta detection in a mixed beta gamma field, Monte Carlo simulation models have been built to optimize the thickness of a plastic scintillator, used in whole body monitor. The simulation has been performed using MCNP/X code and different thicknesses of plastic scintillators ranging from 150 to …
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On the integration of Computational Fluid Dynamics (CFD) simulations with Monte Carlo (MC) radiation transport analysis
… exist whereby radioactive particulates are transported between spatially separated points of interest. An example of this phenomenon is, in the aftermath of a Radiological Dispersal Device (RDD) detonation, the resuspension of radioactive particulates from the resultant fallout field. …
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A Study of Monte Carlo Simulation of Cyclotron Radiation Transport in Fusion Plasmas
Made available in DSpace on 2017-07-06T18:59:17Z (GMT). No. of bitstreams: 3 Vo_Phu_Van_MS.pdf: 43701428 bytes, checksum: b628f64d1906514de180bfc35d9d0a75 (MD5) Vo_Phu_Van_MS_ABS.pdf: 486453 bytes, checksum: 41e03a770d098869c46a1cc31fcc585f (MD5) license.txt: 4813 bytes, checksum: …