Sökning: "scintillators"

Visar resultat 1 - 5 av 34 avhandlingar innehållade ordet scintillators.

1. 1. Tungstate Scintillators Growth, Structures and Properties

   Författare :Magnus Åsberg Dahlborg; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; scintillators; single crystals; ZnWO4; HgWO4; neutron powder diffraction; X-ray diffraction; CdWO4; flux growth; tungstates;

   Sammanfattning : Tungstate crystals are well-known scintillators, which can be used as detector material for high-energy radiation and are often chosen as references in measurements on new luminescent materials. For measurements of excitation and relaxation properties, single crystals are desirable. LÄS MER

3. 2. The zinc group tungstate scintillators : growth, structures and properties

   Författare :Magnus Åsberg Dahlborg; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; scintillators; CdWO4; single crystals; HgWO4; flux growth; X-ray diffraction; AnWO4; neutron diffraction; tungstates;

   Sammanfattning : .... LÄS MER

4. 3. First Principles Calculations of Electron Transport and Structural Damage by Intense Irradiation

   Författare :Carlos Ortiz; Olle Eriksson; Mattias Klintenberg; Richard A. London; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Condense matter theory; electronic structure; quasiparticles; GW theory; molecular dynamics; Boltzmann transport; electron transport; impact ionization; structural damage; dielectric response; structural biology; radiation detectors; scintillators; positron emission tommography; Electronic structure; Elektronstruktur; Semiconductor physics; Halvledarfysik; Biological physics; Biologisk fysik; Critical phenomena phase transitions ; Kritiska fenomen fasövergångar ; Functional materials; Funktionella material; Materiefysik; Physics of Matter;

   Sammanfattning : First principle electronic structure theory is used to describe the effect of crystal binding on radiation detectors, electron transport properties, and structural damage induced by intense irradiation. A large database containing general electronic structure results to which data mining algorithms can be applied in the search for new functional materials, a case study is presented for scintillator detector materials. LÄS MER

5. 4. Modeling of radiative processes in organic scintillators

   Författare :Jenny Nilsson; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : This thesis presents the development of a Monte Carlo calibration of a whole body counter (WBC), consisting of four large plastic (organic) scintillators, used for determine the body burden of gamma-emitting radionuclides. A scintillator emits optical photons after energy has been deposited by an ionizing particle in the scintillator material. LÄS MER

7. 5. Surface coatings as xenon diffusion barriers on plastic scintillators : Improving Nuclear-Test-Ban Treaty verification

   Författare :Lisa Bläckberg; Mattias Klintenberg; Henrik Sjöstrand; Anders Ringbom; Stephan Pomp; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Plastic scintillator; Radioxenon; Diffusion barrier; Surface coating; Atomic Layer Deposition; Comprehensive Nuclear-Test-Ban Treaty; Fysik med inriktning mot tillämpad kärnfysik; Physics with specialization in Applied Nuclear Physics; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

   Sammanfattning : This thesis investigates the ability of transparent surface coatings to reduce xenon diffusion into plastic scintillators. The motivation for the work is improved radioxenon monitoring equipment, used with in the framework of the verification regime of the Comprehensive Nuclear-Test-Ban Treaty. LÄS MER