Global ETD Search
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 25 for “"neutron beams"”.
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Biological dosimetry of neutron beams for neutron capture therapies
Boron neutron capture therapies using the 10B(n,a)7Li reaction have been proposed as treatments for glioblastoma multiforme, metastatic melanoma, rheumatoid arthritis, and other debilitating conditions. This thesis presents the first combined biological and physical dosimetry interbeam comparison …
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Compact neutron sources for Nuclear Physics: from accelerator-based to laser-driven neutron beams
Pulsed neutron beams are a valuable tool in nuclear physics with applications in a wide variety of fields, including fission and fusion, astrophysics, homeland security, medicine, cultural heritage, avionics, and other industrial or research applications. Despite the potential use of neutron beams, …
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Spectral characterization of accelerator-based epithermal neutron beams for BNCT and BNCS using neutron activation foils
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1999.
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Design and dosimetry of epithermal neutron beams for clinical trials of boron neutron capture therapy at the MITR-II reactor
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1994.
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Cross section measurements for neutron induced reactions on Bi targets using quasi mono-energetic neutron beams of 90 and 140 MeV
… were performed using quasi-monoenergetic neutron beams of 90 and 140 MeV energies. Neutron beams were produced from the 7Li(p,n)7Be reaction using the neutron beam facility of iThemba Laboratory for Accelerator Based Science (LABS). Neutron activated target materials ( 209Bi) were …
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Measurement of fluence at the D-line fast neutron facility at iThemba LABS
Measurements of fluence were made for the neutron beams produced at the fast neutron beam facility of iThemba LABS, using an NE213 organic liquid scintillator detector and a 238U fission ionisation chamber. Neutron beams were produced by irradiating a 6 mm natural lithium target with pulsed proton …
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Characterization of a high-current tandem accelerator and the associated development of a water-cooled beryllium target for the production of intense neutron beams
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1997.
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Neutron dosimetry with a water calorimeter
In certain situations neutron radiotherapy has potential advantages over conventional X-ray therapy. It has yet to be conclusively proven that neutron therapy is more efficacious than X-ray therapy, and in many institutions worldwide neutron therapy is currently being evaluated. It is important …
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Computer simulation of neutron capture therapy.
… computer the production and use of reactor neutron beams f or boron capture therapy of brain tumors. The simulation accounts for radiation dose distributions in tissue produced by fast neutrons and by neutron capture reaction products such as gamma rays, C -particles, protons, and heavy …
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Applying Novel Material Characterization Techniques using Ultrafast Laser Excitation and Neutron Diffraction in Radiation Detector Crystals
… precise interactions of low-energy photon and neutron beams.
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A new compact neutron spectrometer
A new compact neutron spectrometer has been designed, developed and characterized. The detector is based on EJ299-33 plastic scintillator coupled to silicon photomultipliers, and a digital implementation of pulse shape discrimination is used to separate events associated with neutrons from those …
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The neutron sensitivities of Geiger-Müller counters
Neutron beams are always accompanied by gamma rays. Because neutrons and gamma rays have different biological effects, it is essential that the neutron and gamma dose components be determined when neutron beams are used for radiotherapy and radiobiology. Since gamma ray dosimeters almost always …
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Deposition of Energy From Low-Energy Neutrons in the Icru Tissue Sphere
… of tissue as a result of being bombarded with neutron beams of varying energies, all the way from 0.3 MeV down to thermal. Absorbed dose and dose equivalent values have been obtained throughout the spherical phantom having the ICRU-prescribed 4-element tissue composition. The basic studies …
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A Monte Carlo calculation of neutron reflection from various curved surfaces
<p>"Plane parallel neutron beams normally incident upon the curved surface of a solid reflector are studied with the Monte Carlo method. The geometries studied are cylindrical, parabolic, and hemispherical. It is shown that when the curved surface is cylindrical, a small "focusing effect" occurs in …
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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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A Magneto-Gravitational Neutron Trap for the Measurement of the Neutron Lifetime
Neutron decay is the simplest example of nuclear beta-decay. The mean decay lifetime is a key input for predicting the abundance of light elements in the early universe. A precise measurement of the neutron lifetime, when combined with other neutron decay observables, can test for physics beyond …
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Engineering design of a fission converter-based epithermal beam for neutron capture therapy
… high intensity and low contamination epithermal neutron beams, for boron neutron capture therapy research and for routine treatment if this becomes a successful modality for treating cancers. A fission converter based design for high performance epithermal neutron beam was developed at the …
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Development and Characterization of a Fast Neutron Imaging Telescope (FNIT) for 1--20 MeV Neutrons From the Sun and Nuclear Material
… of a double scatter telescope for 1--20 MeV neutrons intended for applications in solar physics and nuclear security. In high-energy solar physics, detecting the presence of low energy accelerated ions in the low corona is recognized as an important goal. The surest indication of 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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