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Author : Pierre Convert
Publisher :
ISBN 13 :
Total Pages : 460 pages
Book Rating : 4.:/5 (42 download)
Download or read book Position-sensitive Detection of Thermal Neutrons written by Pierre Convert and published by . This book was released on 1983 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Institut Laue-Langevin
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (779 download)
Download or read book Applications of Position Sensitive Detectors to Thermal Neutron Scattering written by Institut Laue-Langevin and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Two-dimensional Position-sensitive Detector for Thermal Neutrons written by and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermal Neutron Imaging Using A New Pad-Based Position Sensitive Neutron Detector written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermal neutrons (with mean energy of 25 meV) have a scattering mean free path of about 20 m in air. Therefore it is feasible to find localized thermal neutron sources up to ~30 m standoff distance using thermal neutron imaging. Coded aperture thermal neutron imaging was developed in our laboratory in the nineties, using He-3 filled wire chambers. Recently a new generation of coded-aperture neutron imagers has been developed. In the new design the ionization chamber has anode and cathode planes, where the anode is composed of an array of individual pads. The charge is collected on each of the individual 5x5 mm2 anode pads, (48x48 in total, corresponding to 24x24 cm2 sensitive area) and read out by application specific integrated circuits (ASICs). The high sensitivity of the ASICs allows unity gain operation mode. The new design has several advantages for field deployable imaging applications, compared to the previous generation of wire-grid based neutron detectors. Among these are the rugged design, lighter weight and use of non-flammable stopping gas. For standoff localization of thermalized neutron sources a low resolution (11x11 pixel) coded aperture mask has been fabricated. Using the new larger area detector and the coarse resolution mask we performed several standoff experiments using moderated californium and plutonium sources at Idaho National Laboratory. In this paper we will report on the development and performance of the new pad-based neutron camera, and present long range coded-aperture images of various thermalized neutron sources.
Author : C. F. Johnson
Publisher :
ISBN 13 :
Total Pages : 46 pages
Book Rating : 4.3/5 (91 download)
Download or read book BF3 Thermal Neutron Detection Channel written by C. F. Johnson and published by . This book was released on 1954 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Laura Boyd
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (126 download)
Download or read book Characterisation of a Position Sensitive Thermal Neutron Detector written by Laura Boyd and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Alan Paul Jeavons
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.3/5 ( download)
Download or read book A New Position-sensitive Detector for Thermal and Epithermal Neutrons written by Alan Paul Jeavons and published by . This book was released on 1977 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : George M. Jacks
Publisher :
ISBN 13 :
Total Pages : 56 pages
Book Rating : 4.3/5 (91 download)
Download or read book A Study of Thermal and Resonance Neutron Flux Detectors written by George M. Jacks and published by . This book was released on 1961 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (227 download)
Download or read book High-Pressure Helium-3 Scintillation Position-Sensitive Detector of Thermal Neutrons written by and published by . This book was released on 2002 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study is to demonstrate the feasibility of constructing a compact neutron detector that is sensitive to thermal and epithermal neutrons and has high rejection efficiency relative to gamma-ray background. A two-channel high-pressure 3He scintillation detector is considered for the detection of neutrons in coincidence mode. The detector consists of two large avalanche photodiodes viewing a gas volume filled with pressurized 3He. Experiments with the detector demonstrate high efficiency to neutrons and high rejection ability to gamma rays. Position sensitivity of the detector to thermal neutrons is demonstrated and confirmed with computer simulations.
Author :
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (727 download)
Download or read book Position-sensitive Detection of Slow Neutrons written by and published by . This book was released on 1992 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper sets forth the fundamental principles governing the development of position-sensitive detection systems for slow neutrons. Since neutrons are only weakly interacting with most materials, it is not generally practical to detect slow neutrons directly. Therefore all practical slow neutron detection mechanisms depend on the use of nuclear reactions to ''convert'' the neutron to one or more charged particles, followed by the subsequent detection of the charged particles. The different conversion reactions which can be used are discussed, along with the relative merits of each. This is followed with a discussion of the various methods of charged particle detection, how these lend themselves to position-sensitive encoding, and the means of position encoding which can be applied to each case. Detector performance characteristics which may be of importance to the end user are discussed and related to these various detection and position-encoding mechanisms.
Author : R. F. Taschek
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.3/5 (91 download)
Download or read book Radioactive Threshold Detectors for Neutrons written by R. F. Taschek and published by . This book was released on 1946 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : B. H. Meardon
Publisher :
ISBN 13 :
Total Pages : 39 pages
Book Rating : 4.:/5 (169 download)
Download or read book A Survey of Position Sensitive Detectors and Multi-counter Arrays with Particular Reference to Thermal Neutron Scattering written by B. H. Meardon and published by . This book was released on 1972 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : george r. dalton
Publisher :
ISBN 13 :
Total Pages : 149 pages
Book Rating : 4.3/5 (91 download)
Download or read book some aspects of thermal neutron detectors written by george r. dalton and published by . This book was released on 1960 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yacouba Diawara
Publisher : Springer Nature
ISBN 13 : 3031365461
Total Pages : 257 pages
Book Rating : 4.0/5 (313 download)
Download or read book Neutron Detectors for Scattering Applications written by Yacouba Diawara and published by Springer Nature. This book was released on 2023-08-04 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the most common neutron detectors used in neutron scattering facilities and all of those in use at Oak Ridge National Lab. It starts describing the facilities, instruments and the critical detector parameters needed by various instruments. Then the key components of the 3He-based linear position-sensitive detectors as well as on their electronics, which require particular attention to signal processing and noise reduction, are introduced. One chapter is dedicated to the 3He alternatives where scintillators play a critical role. It also covers emerging neutron detection technologies including semiconductors, vacuum-based devices and their associated readouts, which will be required in the future for high rate and high-resolution neutron detectors. The authors explain the logic behind the choice of materials as well as the various constraints that neutron detectors must respect to be useful. Some of these constraints, such as efficiency and gamma-ray sensitivity are common to all neutron counters while others, like timing resolution, dynamic range, and peak counting rate, depend on the applications. The book guides experts, the nuclear science community, and young scholars through the physical processes and the required electronics in a way that is accessible for those not professionally involved in designing detector’s components and electronic circuits.
Author :
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (683 download)
Download or read book High Precision Thermal Neutron Detectors written by and published by . This book was released on 1994 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-dimensional position sensitive detectors are indispensable in neutron diffraction experiments for determination of molecular and crystal structures in biology, solid-state physics and polymer chemistry. Some performance characteristics of these detectors are elementary and obvious, such as the position resolution, number of resolution elements, neutron detection efficiency, counting rate and sensitivity to gamma-ray background. High performance detectors are distinguished by more subtle characteristics such as the stability of the response (efficiency) versus position, stability of the recorded neutron positions, dynamic range, blooming or halo effects. While relatively few of them are needed around the world, these high performance devices are sophisticated and fairly complex; their development requires very specialized efforts. In this context, we describe here a program of detector development, based on 3He filled proportional chambers, which has been underway for some years at Brookhaven. Fundamental approaches and practical considerations are outlined that have resulted in a series of high performance detectors with the best known position resolution, position stability, uniformity of reliability over time of this type.
Author :
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (16 download)
Download or read book Gamma Discrimination in Pillar Structured Thermal Neutron Detectors written by and published by . This book was released on 2012 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid-state thermal neutron detectors are desired to replace 3He tube based technology for the detection of special nuclear materials. 3He tubes have some issues with stability, sensitivity to microphonics and very recently, a shortage of 3He. There are numerous solid-state approaches being investigated that utilize various architectures and material combinations. By using the combination of high-aspect-ratio silicon PIN pillars, which are 2?m wide with a 2?m separation, arranged in a square matrix, and surrounded by 1°B, the neutron converter material, a high efficiency thermal neutron detector is possible. Besides intrinsic neutron detection efficiency, neutron to gamma discrimination is an important figure of merit for unambiguous signal identification. In this work, theoretical calculations and experimental measurements are conducted to determine the effect of structure design of pillar structured thermal neutron detectors including: intrinsic layer thickness, pillar height, substrate doping and incident gamma energy on neutron to gamma discrimination.
Author : T. L. Van Vuure
Publisher : Delft University Press
ISBN 13 : 9789040725616
Total Pages : 120 pages
Book Rating : 4.7/5 (256 download)
Download or read book Thermal-neutron Detection Based on the Gas Electron Multiplier written by T. L. Van Vuure and published by Delft University Press. This book was released on 2004-01-01 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a Ph.D. dissertation. For probing the structure and dynamics of matter at an atomic, molecular and mesoscopic level, elastic and inelastic neutron scattering, diffractometry, reflectometry and a variety of other neutron scattering methods are of utmost importance. For them the availability of highly efficient and fast large-area position-sensitive neutron detectors is a condition of growing importance. In particular, the upcoming third generation of neutron sources, consisting of high-intensity pulsed spallation neutron sources, in conjunction with current progress in neutron optics will increase the peak neutron flux at the spectrometers' samples positions by more than two orders of magnitude. Consequently, much faster detectors than presently available with improved background are required in order to take full advantage of these increased source strengths and us pulse widths. In addition, due to the higher neutron fluxes, longer flight paths and smaller samples can be used and if higher 'matched' spatial detector resolutions are available better lattice resolutions can be attained. The goal of the research described in this dissertation is to develop a thermal neutron detector that meets as many as possible of the requirements being formulated during the ongoing design of the third generation of neutron sources.
