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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Neutron fluence"”.
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Measurement of neutron fluence at En=20-100 MeV using a stacked scintillator spectrometer
… and allows response functions to be measured for neutrons of energy up to 100 MeV, which are minimally affected by charged particle escape.
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Calculation of Neutron Fluence-to-Dose Index Conversion Factors for the Standard Icru Tissue Phantom by the Monte Carlo Method
Made available in DSpace on 2014-12-14T06:26:06Z (GMT). No. of bitstreams: 1 7811221.pdf: 6872930 bytes, checksum: f215c7f7d666eb9881298cc5aefe2a5e (MD5) Previous issue date: 1978
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A Numerical Solution of Low-Energy Neutron Boltzmann Equation
… approximation is created to calculate low energy neutron fluence due to the elastic scattering of evaporation neutrons produced in interactions of high energy particles with target nuclei. This multigroup method is added to NASA Langley Research Center's HZETRN particle transport code. This new …
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Neutron irradiation effects in gallium arsenide
… of n-GaAs as a result of irradiations with fast neutrons have been studied, after epitaxial layers doped with Si at concentrations in the range 1.35 $\times$ 10$\sp{15}$ to 1.60 $\times$ 10$\sp{16}$ cm$\sp{-3}$ were irradiated with reactor neutron fluences up to 1.31 $\times$ 10$\sp{15}$ …
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Innovative design of uranium startup fast reactors
… in different fuel types result in different neutronic performance. The softer spectrum and lower allowable fuel volume fractions of oxide fuel have shorter fuel cycle length due to reactivity constraints, whereas fast neutron fluence plays an important role in determining the fuel cycle …
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Monte Carlo simulations of the iThemba LABS neutron beam facility
The iThemba LABS neutron beam facility is currently being used for various applications of fast neutron studies, such as measurements of fission cross sections, the biological effectiveness of high-energy neutrons, calibration of detectors used for dose monitoring in space and aircrafts, and the …
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PREDICTING THE SENSITIVITY OF A BERYLLIUM/SCINTILLATOR FUSION NEUTRON DETECTOR COMBINING EXPERIMENTAL METHODS AND MONTE CARLO MODELS
… sensitivity of a beryllium/scintillator fusion neutron detector. Neutrons may be captured by the beryllium via the 9Be (n, α) 6He nuclear reaction, where the product nucleus, 6He, decays by beta emission. The beta particles can be detected by close coupling scintillator with the beryllium. The …
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Development of image processing systems for cosmic ray effect analysis
Cosmic neutron radiation in the atmosphere is a harsh environment for modern aircraft electronics. High-energy neutron interactions with silicon produce spurious charge which can cause malfunctioning or even failure to advanced microelectronic devices. To study neutron interactions, a CCD based …
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Measurement of neutron flux spectra in a Tungsten Benchmark by neutron foil activation method
… concept, rely on the results of neutron physical calculations. These depend on the knowledge of the neutron and photon flux spectra which is particularly important because it permits to anticipate the possible answers of the whole structure to phenomena such as nuclear heating, …
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Measurement of neutron production from an ¹⁸O target for the production of radioactive-ion beams at iThemba LABS
… proton beams from a cyclotron. However, neutron-induced fission gives enhanced production of neutron-rich fission fragments compared to proton-induced fission, thus there is a need to find efficient ways of producing neutrons from protons. Beryllium targets have been suggested, but …
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Neutron beam monitoring for single-event effects testing
… described in this thesis aims to develop a neutron beam monitoring system using silicon photodiodes as the detecting elements for accelerated testing of electronics against neutron-induced single event effects (SEEs). The system can measure the transmission along the neutron beam line where …
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Characterization of neutron fields around an intense neutron generator
Neutron fields in the vicinity of the University of Ontario Institute of Technology neutron facility have been investigated in a series of simulations and experiments. The neutron fluence at several locations around the neutron generator facility has been simulated using MCNPX 2.7E Monte Carlo …
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A Forward-Backward Fluence Model for the Low-Energy Neutron Boltzmann Equation
<p>In this research work, the neutron Boltzmann equation was separated into two coupled integro-differential equations describing forward and backward neutron fluence in selected materials. Linear B-splines were used to change the integro-differential equations into a coupled system of ordinary …
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4H silicon carbide particle detectors: study of the defects induced by high energy neutron irradiation
… work it was analyzed the effect of high energy neutron irradiation on 4H-SiC particle detectors. Schottky and junction particle detectors were irradiated with 1 MeV neutrons up to fluence of 1016 cm-2. It is well known that the degradation of the detectors with irradiation, independently of the …
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Fluence-limited burnup as a function of fast reactor core parameters
… but also the maximum permissible fast-neutron fluence in the cladding, especially for reduced uranium enrichment cores using high-albedo MgO reflectors. The intent of this thesis was to determine the best design parameters - fuel type, fuel compound, fuel arrangement, and coolant - …
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Assessment of innovative fuel designs for high performance light water reactors
… as a function of operating temperature and neutron fluence. A comparison of the behavior of the SiC cladding to the conventional Zircaloy cladding demonstrates that the SiC has superior resistance to creep and mechanical degradation due to radiation or oxidation. However, the lower thermal …
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Radiobiological evaluation of new boron delivery agents for boron neutron capture therapy
… (BOPP) and two liposome formulations for neutron capture therapy (BNCT). The methodology utilizes in vitro and in vivo comparisons that characterize compounds relative to boric acid and boronophenylalanine (BPA). In vitro evaluations utilized a colorimetric assay and 96-well plates to …
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Design and testing of a novel neutron survey meter
… which can estimate the effective dose of a neutron field, accounting for both direction and energy of the field. This work represents a novel, real-time, approach to workplace directional neutron dosimetry. A 6Li-loaded scintillator based detector system was developed. This detector system …
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Assessing thermo-mechanical performance of ThO₂ and SiC clad light water reactor fuel rods with a modular simulation tool
… With its use of (ThUPu)O2 and high cladding fluence, new physical models were applied to describe the ThO2-based RBWR fuel rods. The effects of lattice strain induced phonon scattering and semi-conductive electron transport on the thermal conductivity for this ternary fuel mixture were …
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DOSIMETRIC STUDY OF BETA-MINUS EMITTER PRASEODYMIUM-142 : APPLICATIONS IN MICROSPHERE BRACHYTHERAPY FOR HEPATOCELLULAR CARCINOMA AND BRACHYTHERAPY FOR OCULAR SQUAMOUS CELL CARCINOMA
… dose deposition to the treated site. The large neutron activation cross-section of the parent isotope (11.40 barn including that of a meta-stable state) allows the activation of this nuclide in a low neutron fluence reactor, making its production easily available for both research and therapy …
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