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 60 for “"Radioisotopes"”.
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Scavenging and transport of thorium radioisotopes in the North Atlantic Ocean
… a process referred to as “scavenging.” Radioisotopes of thorium, a highly particle-reactive element, have been used extensively to study scavenging in the ocean. However, this process is complicated by the highly variable chemical composition and concentration of particles in oceanic …
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Scavenging and transport of thorium radioisotopes in the North Atlantic Ocean
… a process referred to as "scavenging." Radioisotopes of thorium, a highly particle-reactive element, have been used extensively to study scavenging in the ocean. However, this process is complicated by the highly variable chemical composition and concentration of particles in oceanic …
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Anthropogenic and natural radioisotopes as tracers for contaminant sources and particulate fluxes
… released from anthropogenic sources) and natural radioisotopes as tracers within the Pacific Ocean basin. Artificial radioisotopes released as a result of the 2011 Fukushima Daiichi nuclear power plants accident have the potential to negatively impact human and environmental health. This study …
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Anthropogenic and natural radioisotopes as tracers for contaminant sources and particulate fluxes
… released from anthropogenic sources) and natural radioisotopes as tracers within the Pacific Ocean basin. Artificial radioisotopes released as a result of the 2011 Fukushima Daiichi nuclear power plants accident have the potential to negatively impact human and environmental health. This study …
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Competition in the radioisotopes market: evaluation and analysis of drivers which affect mo-99 market share
This research aims to evaluate competition in the radioisotopes market and to analyze drivers that affect the market share of radioisotopes, particularly Molybdenum 99 (Mo-99), the most widely used radioisotope in medical procedures. Radioisotopes are safe radioactive substances used globally …
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The determination of pure beta-emitters and their behaviour in a salt-marsh environment
… measurement of anthropogenic pure beta-emitting radioisotopes in low-level radioactive wastes and environmental samples. The research focussed on three key pure beta-emitting radioisotopes, namely 63Ni, 90Sr and 99Tc. Iron-55, which decays by electron capture, was also investigated. Source …
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A comparison of three computational phantoms for calibration of a radiation portal monitor used for measurement of internal contamination.
… monitors could measure internally deposited radioisotopes over a short count time (1 second) with a detection limit sufficient to measure 1/10 of an annual limit on intake (ALI) of specific radionuclides. The goal was to determine if portal monitors in nuclear facilities were able to …
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Monte Carlo simulation and experimental studies of the production of neutron-rich medical isotopes using a particle accelerator.
… to an increasing demand for the production of radioisotopes with suitable nuclear and chemical properties. Furthermore, from the literature it is evident that the production of radioisotopes using charged-particle accelerators instead of nuclear reactors is gaining increasing popularity. The …
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In-situ monitoring of groundwater radionuclides with emphasis on tritium detection
… with the detection of low energy beta emitting radioisotopes from a source of groundwater, with particular emphasis on tritium (3H). This is investigated firstly through an understanding of the challenges of detecting tritiated water, which involves the use of Monte Carlo simulations, numerical …
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Epithermal neutron activation analysis of short-lived radionuclides using a pneumatic transport system and a pulsed D-T neutron generator
… epithermal activation products. The three radioisotopes of interest are palladium-107, palladium-109, and germanium-75. The experimental half-lives of each of the three isotopes, with the specific activity in parenthesis are: 21.82±3.71 (49.36 nCi/g), 279.21±27.80 (158.91 nCi/g), and …
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Comparison of selected radiopharmaceutical chromatographic quality control procedures
… evaluated were the- MAC Klt- produced-General Radioisotopes Products, and the TECH Kit by Ackerman Nuclear.</p>
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Development of a duoplasmatron ion source at the Ithemba laboratory for accelerator based science (ithemba labs)
… for neutron-therapy and the production of radioisotopes, as well as for the Van de Graaff accelerator. In comparison with more elaborate sources a cold cathode source is compact, of small mass, uncomplicated in terms of its construction and easy to operate. It was therefore important to …
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Tempo de concentração de pequenas bacias hidrográficas: análise comparativa dos diferentes métodos de uso de traçadores radioativos
… radioactive safety are discussed here. Among the radioisotopes, the 110 Ag was selected and tested with success in form of an anionic complex of high stability, ideal because of its long half-like of 253 days, for areas like Guanabara, where adequate storms may take a long time to occur. Among the …
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Development of HPLC Techniques for the Analysis of Trace Metal Species in the Primary Coolant of a Pressurised Water Reactor
… developed analytical system and by the use of radioisotopes. The particular emphasis during the development has been upon accuracy, reproducibility of recovery, stability of reagents and system contamination, studied by the use of radioisotopes and response to post column reagents. This study …
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Use of Positron Emission to mography For Proton Therapy Verification
… Proton activation of tissue creates progeny radioisotopes according to constituting tissue elements’ cross sections and proton energies. The time-activity-curves from activated tissues can be separated into constituting progeny radioisotopes using a least squares method and then to …
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Development of A Cascade Adsorption Process For Rapid Xenon Concentration From Air For Nuclear Proliferation Monitoring
… a nuclear detonation a significant fraction of radioisotopes consisting of noble gases inevitably escape into the atmosphere and can be used to ascertain the occurrence of such detonations. Noble gas Xe radioisotopes, which are produced in large quantities in nuclear events and have relatively …
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The in vivo proliferation kinetics of human solid tumours
… has been severely handicapped by the need to use radioisotopes and to take sequential biopsies. The drug 5-bromo-2-deoxyuridine (BRdU) is a safe, ethical alternative to tritiated thymidine for in vivo labelling of DNA during the S phase of the cell cycle. The label can be detected by conventional …
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Comprehensive integration of safety, optimization, and regulation in ¹⁷⁷Lu-based theranostic radiopharmaceuticals: from production to dose assessment
In recent decades, medical radioisotopes have transformed cancer diagnosis and treatment. The advent of theranostic radionuclides, enabling both diagnostic and targeted radiotherapy with a single radionuclide, merges two nuclear medicine fields, enhancing personalized targeted radiotherapy through …
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Examining Coastal Marsh Sedimentation In Northeastern North Carolina
… of accelerated sea-level rise. Ceramic tiles, radioisotopes (²¹⁰Pb and ¹³⁷Cs), shoreline mapping, and stable isotope ([delta]¹³C and [delta]¹⁵N) analysis were used to evaluate short-term deposition relative to decadal-scale accumulation and assess whether two marshes in northeastern North …
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