New Approaches for Detection of Wide Energy Spectrum of Neutrons by Nuclear Emulsion Detectors
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Description
Supervisor: Antonio Ereditato
Thesis: PhD U. Bern, AEC (defense: Jul 6, 2017)
Thesis: PhD U. Bern, AEC (defense: Jul 6, 2017)
BORIS DOI
Date of Publication
2017
Publication Type
Other
Division/Institute
Contributor
Ehtesham, Alireza |
Subject(s)
Language
English
Publisher DOI
Description
This thesis summarizes a series of experimental achievements for new approaches in the detection and spectrometry of fast and high energy neutrons in the wide range from 5 MeV to 600 MeV, by using nuclear emulsion detector films. The sensitivity and detection efficiency response of nuclear emulsion detectors are measured. The study is done to study of neutron detection via recoil proton production in a multi-layer detector structure, likewise the Emulsion Cloud Chamber (ECC). Reconstructing proton micro-tracks obtains the tracks with several centimetres length, which is used to calculate and obtain high energy spectrum of detected neutrons. The emulsion film type is made by Fuji company for the OPERA (Oscillation Project with Emulsion tRacking Apparatus) experiment. For this work, a collaboration between facilities and laboratories has been planned. The cooperation was between the CERF facilities at CERN, one of biggest international facilities in neutron physics research and Laboratory for High Energy Physics (LHEP) in the University of Bern which is the biggest nuclear emulsion laboratory in Europe and the second in the world. The thesis presents achievements using the advantages of nuclear emulsion detector, such as the low price, no power supplies during exposure, directional detection, high resolution and wide angular acceptance, which make this type of detector an interesting choice for neutron detection and spectrometry. To be impervious to the magnetic field during exposure, makes nuclear emulsions suitable to use in accelerator and new combined facilities with applied magnetic fields, such as a new generation of therapeutic linear accelerators with magnetic resonance imaging (MRI) machine. Also these favourable circumstances with ability in directional detection help to detect and identify unreachable or hidden nuclear radiation sources, materials or damaged facilities behind thick shielding. For definition and development of this alternative methods of neutron spectrometry, the design, exposure operation and data taking outputs, all are compared to high precision neutron model simulation using version 10.1 of the GEANT4 toolkit after relevant benchmarking and validation for neutron production models.
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File | File Type | Format | Size | License | Publisher/Copright statement | Content | |
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PhD_Thesis_AlirezaEhtesham_UniBern_2017.pdf | text | Adobe PDF | 23.49 MB | published |