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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 51 for “"Radiochemical"”.
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Development of Radiochemical Quality Control Methods for Ra-223 and Th-227 Radiotherapies
<p><strong>Introduction.</strong> Radiolabeled molecules for use in disease detection and targeted treatment are a mainstay of patient management. The majority of radiopharmaceuticals deployed to date undergo a single radioactive transition (decay) to reach a stable ground state. Complex emitters, …
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The application of soluble supports in the radiochemical asymmetric total synthesis of tea flavanols.
Flavan-3-ols such as (—)-epicatechin and (+)-catechin are found in significant concentrations in red wine, green and black teas and cocoa. The radiolabelling of flavan-3-ols for feeding studies would require a short high-yielding route from the point of introduction of the label. …
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Measurement and interpretation of chemical and radiochemical data from PWR in-pile loop runs
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1991.
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Criticality alarm system design guide with accompanying alarm system development for the Radiochemical Processing Laboratory in Richland, Washington
… the Criticality Alarm System developed for the Radiochemical Processing Laboratory (RPL) of Richland, Washington is also included. The analysis for RPL utilized the Monte Carlo code MCNP5 for establishing detector coverage in the facility. Based on the design methodology, significant …
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Distribution of precious metals and geochemistry of lateritic ores
… metals, platinum, palladium, iridium and gold by radiochemical neutron-activation analysis. In addition, the distribution of major, minor and other trace constituents (iron, silicon, magnesium, nickel, cobalt, chromium, copper, manganese, zinc, uranium, sodium, chlorine and scandium) was …
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Direct bromine-80 or bromine-82 labelling of biomolecules via excitation labelling methods: preparation of radiopharmaceuticals
… (or CF₃<sup>80m</sup>Br) was studied. The radiochemical yields of the brominated products are relatively small and range from 1% in the case of bromo-deoxyuridine to 11% for bromoacetic acid. The modification of this technique by adding Cl₂ gas to the reaction mixture improves the yields in …
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Stereochemistry and Mechanism of the Enzyme -Catalyzed Cyclizations of Farnesyl Diphosphate to the Sesquiterpenes Epi -Aristolochene, Epi-Eremophilene and Vetispiradiene
… terminal could not be determined because of low radiochemical purity.
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Radium isotopes as tracers of coastal circulation pathways in the Mid-Atlantic Bight
… Bight were investigated using a combination of radiochemical tracer and hydrographic measurements. The motivation was to provide evidence of transport routes for shelfwater that could be important to the balance of shelf-slope exchange, as well as to the biogeochemical fluxes across this crucial …
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Radium isotopes as tracers of coastal circulation pathways in the Mid-Atlantic Blight
… Bight were investigated using a combination of radiochemical tracer and hydrographic measurements. The motivation was to provide evidence of transport routes for shelfwater that could be important to the balance of shelf-slope exchange, as well as to the biogeochemical fluxes across this crucial …
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Stereochemistry, isotope effects, and inhibition of terpene biosynthesis: I. Stereospecificity and mechanism of monoterpene cyclases. II. Inhibition by heteroatom analogs of carbocation intermediates
… in limonene biosynthesis was elucidated by radiochemical degradation of ($\sp3$H) carvoximes. Limonene cyclases extracted from Citrus sinensis and Perilla frutescens effected regiospecific deprotonation, but pinene cyclases I and II from Salvia officinalis deprotonate non-regiospecifically. …
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Coadsorption of anions and ultra-thin metal films on single crystal electrodes
… were compared with results obtained by in situ radiochemical and electrochemical data. Using Low Energy Electron Diffraction (LEED), the structures of anions/underpotential deposition (UPD) admetals were characterized in different electrodes and electrolytes. For the first time, it was shown …
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Development of A Multi-Purpose Automated Synthesis Module For Production of Novel Pet Radiopharmaceuticals
… of nonradioactive standards, and the yields and radiochemical purities of these radiopharmaceuticals were demonstrated in an acceptable range. Last, the manual synthesis recipes of these drugs were transformed to the automated synthesis recipes which can be practiced in this multi-purpose …
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Investigation of the Stereochemistry of the Methyl-to-Methylene Elimination in the Biosynthesis of Several Terpenes Through the Use of Chiral Methyl Labeled Compounds
… gave the ($\sp2$H, $\sp3$H) olefin in a 10% radiochemical yield. Analysis by $\sp3$H NMR spectroscopy showed 3 peaks in a 5:1:0.7 ratio which correspond to the (12-$\sp2$H, $\sp3$H) -, (12-$\sp1$H, $\sp3$H) -, and (1-$\sp3$H, 12-$\sp2$H) 5-epi-aristolochene, respectively. However, the …
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Determination of radium-226 in drinking water by alpha spectroscopy
A radiochemical procedure for determination of radium-226 (Ra-226) in drinking water was developed. The method involves concentrating radium by coprecipitation with barium sulfate; separating radium from barium and other alkaline earth metals by ion exchange; and electrodepositing radium onto …
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Geometric Algorithms and Data Structures for Simulating Diffusion Limited Reactions
… dose distribution, (2) the generation of radiochemicals based on the physical dose distribution, (3) the simulation of interactions between radiochemicals and bio-matter in the body, and (4) the estimation of biological damage based on the distribution of radiochemicals. This dissertation …
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Development of New Radiolabeling Methods and Insights on Ionizing Radiation Interactions with Nanoparticles
… require the use of specific chelators, with both radiochemical and in vivo evaluation; ii) new chelator-free radiolabeling methods for multimodal nanoparticles; and iii) investigation into mechanisms of interaction between ionizing radiation and a library of nanoparticles, leading to visible and …
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