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 17 of 17 for “"Neutron Dose"”.
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Gamma and neutron dose profiles near a Cf-252 brachytherapy source
… suitable to be used with the conventional high-dose-rate (HDR) remote afterloading systems for interstitial brachytherapy. A recent in-water calibration experiment showed that the measured gamma dose rates near the new source are slightly greater than the neutron dose rates; contradicting the …
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Beam characterization for accelerator-based boron neutron capture therapy using the ⁹Be(d,n) nuclear reaction
… nuclear reaction for accelerator-based boron neutron capture therapies (AB-BNCT) was investigated. The moderated neutron spectra produced at several deuteron bombarding energies were evaluated in terms of dose rates and dosimetric profiles in a water-filled brain phantom using an existing …
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Lithium-6 filter for a fission converter-based Boron Neutron Capture Therapy irradiation facility beam
… method was used to measure the photon, thermal neutron and fast neutron dose. The measured advantage depth is 9.3 ± 0.1cm without filter and 9.9 ± 0.1cm with 8mm lithium-6 filter. The result is consistent with the result of Monte Carlo calculation.
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Neutron production in a spherical phantom aboard the international space station
… that pose specific health risks, are created. Neutrons are one important component of this mixed radiation field due to their high LET. Therefore, the assessment of the neutron dose contribution has become an important part of the safety and monitoring program onboard the ISS. The need to …
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Monte Carlo simulation of neutron shielding for proton therapy facilities
… to develop a Monte Carlo method of modeling neutron shielding of proton therapy facilities in a complex, realistic environment. The bulk neutron shielding of the Northeast Proton Therapy Center (Massachusetts General Hospital, Boston, MA) was used as the basis of the design work. A …
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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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14 MeV neutron generator dose modeling
Modeling and understanding the doses around the neutron generator provides insightful data in regard to radiation safety and protection precautions. Published data can be used to predict doses, but realistic data for the Nuclear Engineering Teaching Laboratory’s Thermo MP 320 Neutron Generator …
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Advanced characterization of the early-stage evolution of microstructures and mechanical properties in neutron-irradiated commercial steels
… Test Reactor (ATR) at different temperatures and neutron fluences. Three temperature ranges and four neutron dose levels were investigated in this study. Utilizing transmission electron microscopy (TEM), atom probe tomography (APT) and energy dispersive X-ray spectroscopy (EDS), the nucleation, …
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Neutron dosimetry, moderated energy spectrum, and neutron capture therapy for ²⁵{45}R²Cf medical sources
Examination of neutron dosimetry for 252Cf has been conducted using calculative and experimental means. Monte Carlo N-ParticIe (MCNP) transport code was used in a distributed computing environment as a parallel virtual machine (PVM) to determine the absorbed neutron dose and neutron energy spectrum …
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Investigation and use of dual (twin) low pressure proportional counters for active neutron-gamma mixed field dosimetry
This thesis tackles accurate neutron-gamma mixed field dosimetry in radiation protection and radiation biology. While passive dosimeters are suitable for measuring low radiation levels, active instruments are necessary in high radiation environments, such as found in nuclear power plants and …
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Accelerator-Based Neutron Branchytherapy
… modality of radiation therapy, Accelerator-Based Neutron Brachytherapy (ABNBT), has been demonstrated through simulations and experimental work. The candidate nuclear reactions investigated are 9Be(d,n)'OB, 9Be(p,n)9B, and 7Li(p,n)7Be, with charged particle beam energies of less than 4.1 MeV. The …
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The application of experimental microdosimetry to mixed-field neutron-gamma dosimetry
Absorbed dose distributions in lineal energy for neutrons and gamma rays were measured by using both a tissue-equivalent walled counter (TEPC) and a graphite-walled low pressure proportional counter (GPC) in the Am-Be neutron source facility at University of Ontario Institute of Technology. A …
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The effect of high dose rate on tissue equivalent proportional counter measurements in mixed neutron-gamma fields
… radiation monitoring in areas where a mixture of neutron and photon radiations may be present, such as those commonly encountered in nuclear power plants. In such radiation fields, the dose rate of each component can vary drastically from extremely low to very high. Among these possible …
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Imaging Techniques for Proton Range Determination in Proton Therapy
… Carlo-based treatment planning system (TPS) for dose prediction comparison with the standard stoichiometric SECT method. Percentage deviation from the ground-truth volume receiving 80% of the prescription dose within a 5 mm distal-ring region around the planning target volume was 2.6% for …
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A new approach to neutron spectrometry with multi-element scintillators
… design and performance. Currently, there is no neutron dosimeter/spectrometer that can meet the requirements in terms of size and performance. In particular, the requirements for high sensitivity, spectroscopic features, and determination of operational quantities to enable radiation protection …
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Bystander Effects Due To Neutrons, And Low-Dose Hyper-Radiosensitivity To Gamma Rays In Human Cells Using Cytogenetics
… human lymphoblastoid cell lines exposed to neutrons or gamma radiation. Micronuclei, nucleoplasmic bridges and nuclear buds were enumerated by recording the coincident presence of these endpoints within individual cells, and the associations among these three endpoints were evaluated for all …
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Radiogenic Second Cancer Risk Differences In Female Hodgkin Lymphoma Patients Treated With Proton Versus Photon Radiotherapies
… therapy has been shown to reduce the therapeutic dose, and therefore, the risk of developing a RSC, to healthy tissue relative to HL photon therapy. Current commercial treatment planning systems (TPS) do not account for stray radiation doses for these treatments, however. The impact of these …