dc.contributor.author | Setterdahl, Lena Marie | |
dc.date.accessioned | 2020-12-18T00:47:10Z | |
dc.date.available | 2020-12-18T00:47:10Z | |
dc.date.issued | 2020-12-18 | |
dc.date.submitted | 2020-12-17T23:00:17Z | |
dc.identifier.uri | https://hdl.handle.net/11250/2720107 | |
dc.description.abstract | This thesis is a "proof-of-principle" study which aims to assess the feasibility of ALPIDE as a neutron imaging sensor when coupled with a natural-Gd converter foil. The neutron detection efficiency of a Gd-based ALPIDE scheme was calculated based on experimentally collected and simulated data. With the Monte Carlo simulation toolkit Geant4, the Gd-based ALPIDE scheme was simulated in a thermal-neutron flux. Numerous simulations were performed where the scheme's and neutron source's features were slightly modified to study parameters of the neutron detection efficiency. Achieved with a back-irradiated thinned-down ALPIDE exposed to a thermal-neutron beam, the highest simulated detection efficiency was 18%. The lowest simulated detection efficiency was 5%, and achieved with a standard ALPIDE chip exposed to an isotropic thermal-neutron flux. Experimental data was collected in an approximately isotropic mixed-energy neutron and gamma flux, which included thermal neutrons. The thermal neutrons were obtained by thermalizing (with plastic blocks) the fast-neutron flux of a F-18 producing PET (Positron Emission Tomography) cyclotron. The Neutron Survey Meter A480 performed control measurements of the thermal-neutron (and fast-neutron) flux (count). Two methods were used to calculate the neutron detection efficiency of the Gd-based ALPIDE setup. The experimentally obtained neutron detection efficiency of the Gd-based ALPIDE was (3.19±0.01)% and (1.50±0.05)%. The "proof-of-principle" study confirmed neutron detection possible with the Gd-based ALPIDE. | |
dc.language.iso | eng | |
dc.publisher | The University of Bergen | |
dc.rights | Copyright the Author. All rights reserved | |
dc.subject | silicon pixel sensor | |
dc.subject | neutron capture | |
dc.subject | Neutron detection | |
dc.subject | Gadolinium | |
dc.subject | ALPIDE | |
dc.title | Thermal Neutron Detection Efficiency of a Gadolinium-Based Silicon Pixel Sensor | |
dc.type | Master thesis | |
dc.date.updated | 2020-12-17T23:00:17Z | |
dc.rights.holder | Copyright the Author. All rights reserved | |
dc.description.degree | Masteroppgave i fysikk | |
dc.description.localcode | PHYS399 | |
dc.description.localcode | MAMN-PHYS | |
dc.subject.nus | 752199 | |
fs.subjectcode | PHYS399 | |
fs.unitcode | 12-24-0 | |