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Tekijä: | Danielsen, Gillis |
Työn nimi: | Optimizing novel technologies for thermal neutron detection |
Optimering av ny teknik för detektering av neutroner | |
Julkaisutyyppi: | Diplomityö |
Julkaisuvuosi: | 2011 |
Sivut: | [16] + 96 + [9] Kieli: eng |
Koulu/Laitos/Osasto: | Matematiikan ja systeemianalyysin laitos |
Oppiaine: | Sovellettu matematiikka (Mat-2) |
Valvoja: | Ehtamo, Harri |
Ohjaaja: | Schulman, Tom ; Orava, Risto |
OEVS: | Sähköinen arkistokappale on luettavissa Aalto Thesis Databasen kautta.
Ohje Digitaalisten opinnäytteiden lukeminen Aalto-yliopiston Harald Herlin -oppimiskeskuksen suljetussa verkossaOppimiskeskuksen suljetussa verkossa voi lukea sellaisia digitaalisia ja digitoituja opinnäytteitä, joille ei ole saatu julkaisulupaa avoimessa verkossa. Oppimiskeskuksen yhteystiedot ja aukioloajat: https://learningcentre.aalto.fi/fi/harald-herlin-oppimiskeskus/ Opinnäytteitä voi lukea Oppimiskeskuksen asiakaskoneilla, joita löytyy kaikista kerroksista.
Kirjautuminen asiakaskoneille
Opinnäytteen avaaminen
Opinnäytteen lukeminen
Opinnäytteen tulostus
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Sijainti: | P1 Ark Aalto 75 | Arkisto |
Avainsanat: | thermal neutrons neutron capture neutron cross section gadolinium boron boron carbide geant4 3n3 semiconductor detector termiska neutroner neutronkapning gadolinium bor borkabid Geant4 3n3 halvledardetektor |
Tiivistelmä (eng): | The field of neutron detection is a burgeoning area of research, spurred not only by advances in semiconductor fabrication, but also by the insu_cient capabilities of conventional techniques for novel applications of neutron radiation. For the past decades the trend in radiation detection has been to move in more and more applications towards semiconductor based detectors because they are cheap, compact and can provide detailed resolution. However, semiconductor neutron detectors have been plagued by low e_ciencies. One proposed way of overcoming this limitation is by manipulating the detector geometry on a microscale. In this thesis the methods to build such detectors are studied and a number of ways to optimize the possible designs are proposed. Geometrical optimization is based around precise Monte Carlo methods realized in the Geant4 framework. Neutron interaction is modeled in three dimensional microstructures to find the optimal structure for converting neutrons to measurable ionizing radiation. The used sophisticated simulation allows taking into account a number of factors discarded by previous authors. A prototype detector was built and experimental testing was completed to verify the predictions of the Monte Carlo modeling. Simulation results show that these microstructures have the capability to produce a manifold improvement in detection e_ciency over conventional semiconductor neutron detectors. Simulation results were also well in line with experimental results. |
ED: | 2011-09-26 |
INSSI tietueen numero: 42805
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