Sökning: "cadmium telluride"

Visar resultat 1 - 5 av 6 avhandlingar innehållade orden cadmium telluride.

  1. 1. A Segmented Silicon Strip Detector for Photon-Counting Spectral Computed Tomography

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Cheng Xu; KTH.; [2012]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; photon counting; spectral computed tomography; silicon strip detector; ASIC; energy resolution; cadmium telluride; charge sharing; Monte Carlo simulation; synchrotron;

    Sammanfattning : Spectral computed tomography with energy-resolving detectors has a potential to improve the detectability of images and correspondingly reduce the radiation dose to patients by extracting and properly using the energy information in the broad x-ray spectrum. A silicon photon-counting detector has been developed for spectral CT and it has successfully solved the problem of high photon flux in clinical CT applications by adopting the segmented detector structure and operating the detector in edge-on geometry. LÄS MER

  2. 2. In situ measurements of radionuclide concentration in soil An investigation into detector properties and methods

    Detta är en avhandling från Stockholm : Department of Physics, Stockholm University

    Författare :Johan Kastlander; Stockholms universitet.; [2010]
    Nyckelord :In situ gamma-ray spectrometry; LaBr3; CdTe; Cs-137; soil samples; fysik; Physics;

    Sammanfattning : In case of a release of radioactive nuclides into the environment it is necessary to  have reliable methods to estimate the potential effect on people and the ecosystem. In this context the total activity deposited, the elemental composition and the depth distribution are of importance. LÄS MER

  3. 3. Development of methods for in situ measurements of radioactivity in the enviroment

    Detta är en avhandling från Stockholm : Department of Physics, Stockholms universitet

    Författare :Johan Kastlander; Stockholms universitet.; [2007]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; In situ gamma ray spectrometry; CdTe; HPGe; NATURAL SCIENCES Physics Nuclear physics Low energy physics; NATURVETENSKAP Fysik Kärnfysik Lågenergifysik;

    Sammanfattning : In case of a release of radioactive nuclides into the environment it is necessary to have reliable methods to estimate the potential effect on population and ecosystem. In this context the total activity deposited, the elemental composition and its depth distribution are of importance. LÄS MER

  4. 4. Fabrication and Applications of a Focused Ion Beam Based Nanocontact Platform for Electrical Characterization of Molecules and Particles

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Tobias Blom; Uppsala universitet.; [2010]
    Nyckelord :Focused Ion Beam; FIB; Scanning Electron Microscopy; SEM; Nanogap electrodes; Nanostructuring; Nanofabrication; Electron Beam Lithography; Electrical characterization; Dielectrophoresis;

    Sammanfattning : The development of new materials with novel properties plays an important role in improving our lives and welfare. Research in Nanotechnology can provide e.g. cheaper and smarter materials in applications such as energy storage and sensors. LÄS MER

  5. 5. Calculations of defect related properties in semiconductors

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Sven Öberg; Luleå tekniska universitet.; [1992]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Scientific Computing; Teknisk-vetenskapliga beräkningar;

    Sammanfattning : Many of the most important and useful properties of crystalline materials, such as mechanical strength and electrical resistance, are determined by the presence of lattice defects and impurities. Well known examples are dislocations which control plastic flow and make metals ductile, and dopant atoms which control the extrinsic conduction in semiconductors and insulators. LÄS MER