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Author: Ahmed Ali Alghamdi Publisher: ISBN: Category : Neutrons Languages : en Pages : 107
Book Description
The radiation detection field has been rapidly growing in the recent three decades due to the Special Nuclear Materials (SNM) proliferation hazards. Monitoring and detecting SNM with high resolution has been a practical issue. Recently, Neutron Scatter Camera (NSC) addressed this issue by identifying the different SNM with high efficiency. However, the huge size of the detection system beside the poor resolution requires developing an alternative NSC. Two Diamond-based Neutron Scatter Camera (DNSC) systems were investigated. The two-diamond array demonstrated good energy resolution of reconstructing spectrum of multiple neutron sources. Moreover, the spectrum of 239PuBe source was reconstructed experimentally via the two-diamond array NSC. The measured spectrum agreed well with the peak of 3 and 10 MeV. On the other hand, the diamond array, in addition to its capability of spectroscopy, pinpointed several neutron sources. For instance, the simulated system could locate and identify a highly active 252Cf source ( 2.3*1010 n/s) placed 1 meter away within 6 hours.The Chi-Nu measurements started back in 2012 at Los Alamos National Lab to obtain more accurate data of fission neutrons. In this dissertation, a novel Double Time-of-Flight (DToF) detection system was utilized to investigate the capability of reconstructing the prompt fission neutrons spectra that were produced by the fast neutron irradiation of two fissile materials which coated a diamond detector. Unlike the Chi-Nu, DToF simulation measurements used only one type of detector (diamond detectors) for all neutron energy range. The simulation results represented good resolution but more accurate correction factors are needed for the low detection efficiency (≈3%) of the system. Protecting astronauts for future space missions from galactic cosmic rays (GCR) is an issue for NASA. Identifying the light ions that strike through the spaceship craft is the first goal to design a shielding material. To address this issue, a [delta]E/[delta]E detector was explored for the measurement of Minimum Ionizing Particles (MIPs) using the beam-line at the NASA Space Radiation Laboratory (NSRL). The measurements were analyzed by Geant4 simulation, which showed promising results in using a delta]E/[delta]E detector to define interacted isotopes.
Author: Ahmed Ali Alghamdi Publisher: ISBN: Category : Neutrons Languages : en Pages : 107
Book Description
The radiation detection field has been rapidly growing in the recent three decades due to the Special Nuclear Materials (SNM) proliferation hazards. Monitoring and detecting SNM with high resolution has been a practical issue. Recently, Neutron Scatter Camera (NSC) addressed this issue by identifying the different SNM with high efficiency. However, the huge size of the detection system beside the poor resolution requires developing an alternative NSC. Two Diamond-based Neutron Scatter Camera (DNSC) systems were investigated. The two-diamond array demonstrated good energy resolution of reconstructing spectrum of multiple neutron sources. Moreover, the spectrum of 239PuBe source was reconstructed experimentally via the two-diamond array NSC. The measured spectrum agreed well with the peak of 3 and 10 MeV. On the other hand, the diamond array, in addition to its capability of spectroscopy, pinpointed several neutron sources. For instance, the simulated system could locate and identify a highly active 252Cf source ( 2.3*1010 n/s) placed 1 meter away within 6 hours.The Chi-Nu measurements started back in 2012 at Los Alamos National Lab to obtain more accurate data of fission neutrons. In this dissertation, a novel Double Time-of-Flight (DToF) detection system was utilized to investigate the capability of reconstructing the prompt fission neutrons spectra that were produced by the fast neutron irradiation of two fissile materials which coated a diamond detector. Unlike the Chi-Nu, DToF simulation measurements used only one type of detector (diamond detectors) for all neutron energy range. The simulation results represented good resolution but more accurate correction factors are needed for the low detection efficiency (≈3%) of the system. Protecting astronauts for future space missions from galactic cosmic rays (GCR) is an issue for NASA. Identifying the light ions that strike through the spaceship craft is the first goal to design a shielding material. To address this issue, a [delta]E/[delta]E detector was explored for the measurement of Minimum Ionizing Particles (MIPs) using the beam-line at the NASA Space Radiation Laboratory (NSRL). The measurements were analyzed by Geant4 simulation, which showed promising results in using a delta]E/[delta]E detector to define interacted isotopes.
Author: Thomas Greogry Wulz Publisher: ISBN: Category : Chemical vapor deposition Languages : en Pages : 101
Book Description
First, the radiation detection charge collection properties have been determined for four diamonds with each diamond having received a fluence of 1 MeV neutron irradiation. Photoluminescence measurements were conducted at 150 K on the most irradiated diamond, revealing information about the energies of optically-active defect centers created by the neutron radiation. Then, two diamond plates, one single-crystal and the other polycrystalline, were processed using the bulk microstructural modification technique of femtosecond-pulsed laser machining. Deep reactive ion etching of the samples revealed that the laser-treated channels etch considerably faster than the surrounding diamond. Next, to create through-diamond vias (TDVs) in diamond plates, deep reactive ion etching techniques similar to those employed in the silicon industry for creating through-silicon vias were utilized. Two different diamonds, one optical-grade and one detector-grade, were used to establish a repeatable process for etching holes completely through diamond. A stainless steel foil was found to be an effective and robust etching mask for creating TDVs with an aspect ratio of 5.0. Electroplating was used to fill the TDVs with a highly conductive chromium metal. The TDVs were connected with interdigitated strips on the surface of the diamond, establishing for the first time a 3D diamond radiation detector with fully metal electrodes. Lastly, the spatial uniformity of the light emission produced by a relatively new scintillation crystal composed of potassium strontium iodide activated with europium has been explored.
Author: Yuri Erastovich Penionzhkevich Publisher: World Scientific ISBN: 9814632058 Category : Science Languages : en Pages : 691
Book Description
This book is a collection of talks presented at the First International African Symposium on Exotic Nuclei (IASEN-2013). The symposium was held at Cape Town, South Africa from 2 - 6 December 2013. The IASEN2013 was dedicated to the problems of producing and investigating nuclei far from the line of stability. The symposium was organized by two scientific centers: iThemba LABS, South Africa and the Joint Institute for Nuclear Research (Dubna).The main goal of the Symposium was to discuss the latest results on the production and study of the properties of the lightest to heaviest nuclei, as well as the plans for future joint investigations in the field of exotic nuclei. The talks were presented by the leading scientists in the field. Among the topics of the symposium were the following: production and study of properties of nuclei in extreme states, strongly deformed nuclei, highly excited and nuclei far from the line of stability as well as nuclei having large angular momenta. New results of the investigations are presented in this book. In particular, the latest results on the synthesis of new superheavy elements are also presented. At the Symposium were talks devoted to existing detecting devices and accelerators of exotic nuclei as well as to the future projects for the creation of similar set-ups.
Author: Michele Barone Publisher: World Scientific ISBN: 9814478083 Category : Science Languages : en Pages : 1162
Book Description
The exploration of the subnuclear world is done through increasingly complex experiments covering a wide range of energies and in a large variety of environments — from particle accelerators, underground detectors to satellites and space laboratories. For these research programs to succeed, novel techniques, new materials and new instrumentation need to be used in detectors, often on a large scale. Hence, particle physics is at the forefront of technological advancement and leads to numerous applications. Among these, medical applications have a particular importance due to the health and social benefits they bring. This volume reviews the advances made in all technological aspects of current experiments in the field.
Author: Miles Hansard Publisher: Springer Science & Business Media ISBN: 1447146581 Category : Computers Languages : en Pages : 102
Book Description
Time-of-flight (TOF) cameras provide a depth value at each pixel, from which the 3D structure of the scene can be estimated. This new type of active sensor makes it possible to go beyond traditional 2D image processing, directly to depth-based and 3D scene processing. Many computer vision and graphics applications can benefit from TOF data, including 3D reconstruction, activity and gesture recognition, motion capture and face detection. It is already possible to use multiple TOF cameras, in order to increase the scene coverage, and to combine the depth data with images from several colour cameras. Mixed TOF and colour systems can be used for computational photography, including full 3D scene modelling, as well as for illumination and depth-of-field manipulations. This work is a technical introduction to TOF sensors, from architectural and design issues, to selected image processing and computer vision methods.
Author: Helmuth Spieler Publisher: OUP Oxford ISBN: 0191523658 Category : Technology & Engineering Languages : en Pages : 513
Book Description
Semiconductor sensors patterned at the micron scale combined with custom-designed integrated circuits have revolutionized semiconductor radiation detector systems. Designs covering many square meters with millions of signal channels are now commonplace in high-energy physics and the technology is finding its way into many other fields, ranging from astrophysics to experiments at synchrotron light sources and medical imaging. This book is the first to present a comprehensive discussion of the many facets of highly integrated semiconductor detector systems, covering sensors, signal processing, transistors and circuits, low-noise electronics, and radiation effects. The diversity of design approaches is illustrated in a chapter describing systems in high-energy physics, astronomy, and astrophysics. Finally a chapter "Why things don't work" discusses common pitfalls. Profusely illustrated, this book provides a unique reference in a key area of modern science.
Author: Ahmed Ali Alghamdi
Author: Ahmed Ali Alghamdi
Author: Thomas Greogry Wulz
Author: 
Author: Yuri Erastovich Penionzhkevich
Author: Michele Barone
Author: Miles Hansard
Author: 
Author: Helmuth Spieler
Author: 
Author: