Searched for: faculty:"Interfaculty%5C+Reactor%5C+Institute"
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Van Vuure, T.L. (author)
Future high luminosity spallation neutron sources put strenuous demands on detector performance. This research has focused on applying the Gas Electron Multiplier (GEM) to meet most criteria, most notably mm spatial resolution, 1 MHz local countrate (per pixel) and 70% efficiency for 0.18 nm neutrons. The choice for this detector type was made...
doctoral thesis 2004
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Degenaar, I.H. (author)
Large-sample prompt-gamma neutron-activation analysis, or shortly LS PGNAA, is a method by which mass fractions of elements can be determined in large samples with a mass over 1 kg. In this method the large sample is irradiated with neutrons. Directly (prompt) after absorption of the neutrons photons are emitted. The presence of elements can be...
doctoral thesis 2004
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Dicker, G. (author)
The conjugated polymer poly(3-hexylthiophene) is a promising candidate for applications in organic thin-film electronic and optoelectronic devices. This dissertation addresses fundamental issues regarding the photogeneration and recombination dynamics of charge carriers in this polymer. Measurements were carried out using an electrodeless, low...
doctoral thesis 2004
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Baas, H.W. (author)
Neutron activation analysis is a powerful technique for the determination of trace-element concentrations. Since both neutrons that are used for activation and gamma rays that are detected have a high penetrating power, the technique can be applied for relatively large samples (up to 13 L), as demonstrated by Overwater. This technique resulted...
doctoral thesis 2004
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Farahmand, M. (author)
Ionising radiation causes a wide variety of effects in biological targets. In experimental microdosimetry these effects are studied by investigating the statistical distribution of energy deposition events at the microscopic level employing a Tissue-Equivalent Proportional Counter (TEPC). A TEPC is usually designed with a cavity of a few...
doctoral thesis 2004
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Neeft, E.A.C. (author)
Fission of actinides from nuclear waste in inert matrices (materials without uranium) can reduce the period in time that nuclear waste is more radiotoxic than uranium ore that is the rock from which ordinary reactor fuel is made. A pioneering study is performed with the inert matrices: MgO, MgAl2O4, Y3Al5O12, Y2O3 and CeO2-x. These inert...
doctoral thesis 2004
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Damen, P.M.G. (author)
In order to reduce the long-term radiotoxicity of spent nuclear fuel, many studies are performed on partitioning and transmutation of actinides. In such a scenario, the long-lived radio-isotopes (mostly actinides) are partitioned from the nuclear waste, and subsequently transmuted or fissioned in a neutron flux in shorter-lived or stable...
doctoral thesis 2003
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Frahn, M.S. (author)
Each year over one billion pounds of acrylic-based polymeric products are produced world wide. Such products include windows in aircraft, lenses in eyeglasses and CD players, coatings on parquet flooring and various architectural structures such as skylights and domes. Often these products are made by injecting monomer or monomer solutions into...
doctoral thesis 2003
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Escobar Galindo, R. (author)
The study of thin protective coatings is one of the major research topics in the industry. Among the many questions in this wide topic, the aim of this thesis has been to contribute to the understanding of two of them: the problem of the adhesion and the role of porosity in thin films. The thin films studied in this work were mainly...
doctoral thesis 2003
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Grozema, F.C. (author)
Conjugated polymers are of considerable current interest because of their semi-conducting and light-emitting properties. These properties, combined with their relatively low cost and good processability as compared to inorganic semiconductors, make them attractive candidates for application in plastic electronic devices. Conjugated polymers are...
doctoral thesis 2003
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Van Loef, E.V.D. (author)
Scintillators have been used for decades to make ionising radiation visible. Either by direct observation of the light flash produced by the material when it is exposed to radiation, or indirect by use of a photomultiplier tube or photodiode. Despite the enormous amount of commercially available scintillators, the ideal scintillator that...
doctoral thesis 2003
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Weltje, L. (author)
The lanthanides consist of a group of fifteen homologous metals and together with scandium (Sc) and yttrium (Y) they are known as the rare earth elements (REE). Contrasting to what this name suggests they are not rare at all and lanthanides can be found in most soils and sediments in quantities comparable to those of Pb and Cd. However, their...
doctoral thesis 2003
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Uca, O. (author)
Spin-Echo Small-Angle Neutron Scattering (SESANS) instrument is a novel SANS technique which enables one to characterize distances from a few nanometers up to the micron range. The most striking difference between normal SANS and SESANS is that in SESANS one gets information in real space, whereas in a SANS measurement one obtains data in...
doctoral thesis 2003
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Falub, C.V. (author)
Positron annihilation spectroscopy is a powerful method to study materials containing very small concentrations of atomic defects and embedded quantum dots. Depending on the method of producing positrons, there are bulk spectroscopies using fast positrons and depth profiling spectroscopies using slow positrons. Both types of spectroscopies are...
doctoral thesis 2002
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Sonsky, J. (author)
Radiation detectors are used in a variety of fields to sense X-rays and y-rays, visible, UV and IR photons, neutrons or charged particles. With their help, advanced medical diagnostics can be performed (e.g. X-ray radiography, computed tomography, fluoroscopy), material research can undergo a rapid development (e.g. X-ray microanalysis, X-ray...
doctoral thesis 2002
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Zeevaart, J.R. (author)
In a quest for more effective radiopharmaceuticals for palliation of pain experienced by metastatic bone cancer patients, results obtained with the therapeutic radionuclides 153 SM, 166 Ho and 117mSn complexed to bone-seeking phopsphate ligands are related. As phosphonates are known to enhance the remodelling of bone and to have the ability to...
doctoral thesis 2001
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Kemner, E. (author)
Zeolites are crystalline aluminosilicates with a three-dimensional open framework structure of channels and cavities of molecular dimensions. Zeolites can thus act as molecular sieves, making catalytic centres in the interior of the zeolite only accessible to molecules of the correct size. Such catalytic centres, especially clusters of...
doctoral thesis 2001
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Kaiser, C.T. (author)
Up to a few years ago, muon spin rotation/relaxation (μSR [muonSR]) was used as a complementary technique in the study of magnetic intermetallic materials. Application of μSR [muonSR], however, covers a much wider range of scientific disciplines. A shift in scientific interest within the department away from metallic magnets, focused attention...
doctoral thesis 2001
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Van der Meer, Y. (author)
While hydrodesulfurization (HDS) is a process that has already been used for over 50 years and has received large attention in the literature, the world-wide trend towards ultra clean fuels has renewed the interest in HDS catalysis research. EU regulations with respect to fuel specifications involve reduction of the sulfur content in diesel from...
doctoral thesis 2001
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Marsman, M. (author)
The optical characteristics of the Ce3+ ion are largely determined by the geometry of the direct environment of the cerium-ion, and are often very sensitive to changes in this environment. These changes are for example periodic changes because of thermal movements of the atoms in the grid, but also because of static changes such as an optical...
doctoral thesis 2001
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