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Author: Publisher: ISBN: Category : Languages : en Pages : 12
Book Description
An evaluation of the spectral performance of eight planar mereuric iodide (HgI2) gamma-ray detectors under continuous bias voltage for a duration of up to 2000 hours has demonstrated the high degree of long-term stability of mercuric iodide as a radiation detector material. Spectral parameters determined in this evaluation include the %FWHM, the peak-to-valley and peak-to-background rati - in stability of the full energy peak and the preamplifier offset voltages Isotopes with three distinct energies were used for these measurements. 137Cs(662 keV), 57Co(122 keV) and 241Am (59 keV). The spectra were analyzed and spectral parameters were generated using Robwin@, a spectral analysis program developed by Constellation Technology. Robwin@ performs simultaneous non-linear fitting of several key elements of the spectrum, emphasizing the continuum for the entire spectrum, the photopeak response function of all lines in the spectrum, the relative intrinsic efficiency of the detector and the photopeak resolution width. These findings provide further support for the widespread use of mercuric iodide as a room temperature semiconductor radiation detector material for energy spectrometry.
Author: Publisher: ISBN: Category : Languages : en Pages : 12
Book Description
An evaluation of the spectral performance of eight planar mereuric iodide (HgI2) gamma-ray detectors under continuous bias voltage for a duration of up to 2000 hours has demonstrated the high degree of long-term stability of mercuric iodide as a radiation detector material. Spectral parameters determined in this evaluation include the %FWHM, the peak-to-valley and peak-to-background rati - in stability of the full energy peak and the preamplifier offset voltages Isotopes with three distinct energies were used for these measurements. 137Cs(662 keV), 57Co(122 keV) and 241Am (59 keV). The spectra were analyzed and spectral parameters were generated using Robwin@, a spectral analysis program developed by Constellation Technology. Robwin@ performs simultaneous non-linear fitting of several key elements of the spectrum, emphasizing the continuum for the entire spectrum, the photopeak response function of all lines in the spectrum, the relative intrinsic efficiency of the detector and the photopeak resolution width. These findings provide further support for the widespread use of mercuric iodide as a room temperature semiconductor radiation detector material for energy spectrometry.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Gamma-ray spectra with energies up to 1.3 MeV have been detected for the first time with 1-cm-thick HgI2 semiconductor detectors at room temperature. The spectra can be taken using a long, 10 .mu.s, or a short, 0.5 .mu.s, charge collection time. The latter has produced better results with better peak efficiency, higher peak-to-valley ratio, and fewer low energy counts with little sacrifice in resolution. Spectra for energies between 100 keV and 1.3 MeV and descriptions of the techniques for their acquisition are presented. The thick detectors need a conditioning treatment, which is described, prior to showing spectral response.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Mercuric iodide detectors up to 1.5 cm in thickness and with active areas of up to 17 cm2 were fabricated and used as room-temperature, portable, gamma-ray counters. Most of the detectors show no photopeak spectral resolution, but the end point energies of various gamma radiation sources are linear with energy. The detectors are biased with about 103 V/cm, which can be provided in a portable package with a rechargeable capacitor. The nuclear performance of these counters is described.
Author: National Aeronautics and Space Adm Nasa Publisher: Independently Published ISBN: 9781792701979 Category : Languages : en Pages : 32
Book Description
The primary goals of this project are development of the technology for HgI2 photodetectors (PD's), development of a HgI2/scintillator gamma detector, development of electronics, and development of a prototype gamma spectrometer. Work on the HgI2 PD's involved HgI2 purification and crystal growth, detector surface and electrical contact studies, PD structure optimization, encapsulation and packaging, and testing. Work on the HgI2/scintillator gamma detector involved a study of the optical - mechanical coupling for the optimization of CsI(Tl)/HgI2 gamma ray detectors and determination of the relationship between resolution versus scintillator type and size. The development of the electronics focused on low noise amplification circuits using different preamp input FET's and the use of a coincidence technique to maximize the signal, minimize the noise contribution in the gamma spectra, and improve the overall system resolution. Iwanczyk, Jan S. NASA-CR-194819, NAS 1.26:194819 NAS7-1204...
Author: Gordon Gilmore Publisher: John Wiley & Sons ISBN: 1119964695 Category : Science Languages : en Pages : 597
Book Description
The Second Edition of Practical Gamma-Ray Spectrometry has been completely revised and updated, providing comprehensive coverage of the whole gamma-ray detection and spectrum analysis processes. Drawn on many years of teaching experience to produce this uniquely practical volume, issues discussed include the origin of gamma-rays and the issue of quality assurance in gamma-ray spectrometry. This new edition also covers the analysis of decommissioned nuclear plants, computer modelling systems for calibration, uncertainty measurements in QA, and many more topics.
Author: Publisher: Academic Press ISBN: 0080571999 Category : Science Languages : en Pages : 625
Book Description
Since its inception in 1966, the series of numbered volumes known as Semiconductors and Semimetals has distinguished itself through the careful selection of well-known authors, editors, and contributors. The"Willardson and Beer"Series, as it is widely known, has succeeded in publishing numerous landmark volumes and chapters. Not only did many of these volumes make an impact at the time of their publication, but they continue to be well-cited years after their original release. Recently, Professor Eicke R. Weber of the University of California at Berkeley joined as a co-editor of the series. Professor Weber, a well-known expert in the field of semiconductor materials, will further contribute to continuing the series' tradition of publishing timely, highly relevant, and long-impacting volumes. Some of the recent volumes, such as Hydrogen in Semiconductors, Imperfections in III/V Materials, Epitaxial Microstructures, High-Speed Heterostructure Devices, Oxygen in Silicon, and others promise indeed that this tradition will be maintained and even expanded. Reflecting the truly interdisciplinary nature of the field that the series covers, the volumes in Semiconductors and Semimetals have been and will continue to be of great interest to physicists, chemists, materials scientists, and device engineersin modern industry. - One of the first comprehensive works on room-temperature nuclear detectors - Edited by technical experts in the field - Written by recognized authorities from industrial and academic institutions - Focused on the electrical, optical, and structural properties of semiconductors used for room-temperature nuclear detectors
Author: Gordon Gilmore Publisher: John Wiley & Sons ISBN: 111989610X Category : Science Languages : en Pages : 549
Book Description
The cutting-edge new edition of the classic introduction to radioactive measurement Gammy-Ray Spectrometry is a key technique in the study of radioactive decay. It measures the rate and extent of radioactivity from a variety of sources, both natural and artificial, including cosmic ray sources, nuclear reactors, high-energy physics experiments, and more. The resulting data can be essential to environmental monitoring and to a range of experimental sciences. For years, Practical Gamma-Ray Spectrometry has served as the classic introduction to this area for current or aspiring practitioners. A comprehensive but accessible treatment of the subject, with a thorough discussion of all major classes of detectors and their associated electronic systems, it contains everything a researcher needs to make optimal gamma-ray measurements. Now fully updated to reflect the latest technology and experimental data, it is a must-own for researchers looking to incorporate gamma-ray spectrometry into their scientific practice. Readers of the third edition of Practical Gamma-Ray Spectrometry will also find: Fault-finding guide for rapid and effective problem resolution Workshop-style approach emphasizing the fundamentals of laboratory practice New sections dealing with novel developments in nuclear structure research, measuring effects of pollution and climate change, new semiconductor detectors, and more Practical Gamma-Ray Spectrometry is ideal for PhD students and practicing gamma-ray spectroscopists, including researchers working on radiation, energy and environmental monitoring professionals, and researchers working in physics, archaeometry, and related subjects.
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Author: James E. Baciak
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Author: National Aeronautics and Space Adm Nasa
Author: Gordon Gilmore
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Author: Gordon Gilmore