Monte Carlo Simulation of the Complete Spectral Response of Prompt Gamma Ray Analysis Systems PDF Download
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Author: Youngho Jin
Publisher:
ISBN:
Category :
Languages : en
Pages : 144
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Book Description
Author: Youngho Jin
Publisher:
ISBN:
Category :
Languages : en
Pages : 144
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Book Description
Author:
Publisher:
ISBN:
Category : Apologetics
Languages : en
Pages : 444
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Author: William Claude Hopkins
Publisher:
ISBN:
Category :
Languages : en
Pages : 112
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Book Description
Author: Thomas Christopher Clark
Publisher:
ISBN:
Category :
Languages : en
Pages : 340
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The Monte Carlo code (CEARPGA I) was developed to generate the elemental library spectra required for implementing the Monte Carlo Library Least-Squares algorithm for prompt gamma-ray neutron activation analysis (PGNAA). The existing big weight problem in which a few histories yield very large weights with very large variance has been investigated thoroughly. It has been found that the expected value splitting technique, a powerful variance reduction technique used in the code is the primary cause of this problem. Two Monte Carlo simulation approaches have been investigated to eliminate the big weight problem while still maintaining high efficiency. They are 1) score importance map with batch tracking and 2) analog linear interpolation. Both approaches were implemented separately in the corresponding Monte Carlo codes on the basis of CEARPGA I code and demonstrated to be feasible for solving the big weight problem. The analog linear interpolation approach was selected to incorporate into the new CEARPGA Monte Carlo code (CEARPGA II). A comparison of the results obtained by both CEAEPGA I and CEARPGA II codes as well as experimentally measured data shows that the big weight problem has been successfully eliminated, the accuracy of the simulation has improved greatly, and the simulated results agree very well with the measured data. In addition, some other important improvements have been made in the CEARPGA II to make it more accurate, efficient and powerful, including: 1) tracking pair production gamma rays, 2) incorporating neutron activation background spectra, 3) generating natural background spectra, 4) taking into account the non-linearity of NaI detectors, and 5) adopting a general geometry package.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
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Book Description
An implementation of the Electron Gamma Shower 4 code (EGS4) has been developed to allow convenient simulation of typical gamma ray measurement systems. Coincidence gamma rays, beta spectra, and angular correlations have been added to adequately simulate a complete nuclear decay and provide corrections to experimentally determined detector efficiencies. This code has been used to strip certain low-background spectra for the purpose of extremely low-level assay. Monte Carlo calculations of this sort can be extremely successful since low background detectors are usually free of significant contributions from poorly localized radiation sources, such as cosmic muons, secondary cosmic neutrons, and radioactive construction or shielding materials. Validation of this code has been obtained from a series of comparisons between measurements and blind calculations. The singles counting efficiency of a particular counting experiment was reproduced within the accuracy of the known dimensions of the detector components. This allowed the complete simulation of a nuclear decay, including two coincident gamma rays with a non-isotropic angular correlation. In addition, text-book efficiency curves have been reproduced for several sizes of sodium iodide detectors. Examples of the use and several spectral results are presented.
Author: OECD Nuclear Energy Agency
Publisher: OECD
ISBN:
Category : Mathematics
Languages : en
Pages : 492
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Book Description
On cover & title page: OECD documents
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 768
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Author: American Nuclear Society
Publisher:
ISBN:
Category : Nuclear engineering
Languages : en
Pages : 922
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Author: Paul G. Pearson
Publisher: CRC Press
ISBN: 9781560323174
Category : Medical
Languages : en
Pages : 640
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Book Description
The second edition of a bestseller, this book presents the latest innovative research methods that help break new ground by applying patterns, reuse, and design science to research. The book relies on familiar patterns to provide the solid fundamentals of various research philosophies and techniques as touchstones that demonstrate how to innovate research methods. Filled with practical examples of applying patterns to IT research with an emphasis on reusing research activities to save time and money, this book describes design science research in relation to other information systems research paradigms such as positivist and interpretivist research.
