Neutron Field Perturbation in Large Sample Activation Analysis Using Monte Carlo Code PDF Download
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Author: Rosnie Akang
Publisher:
ISBN:
Category : Monte Carlo method
Languages : en
Pages : 95
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Author: Rosnie Akang
Publisher:
ISBN:
Category : Monte Carlo method
Languages : en
Pages : 95
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Author: Christian Amevi Adjei
Publisher:
ISBN:
Category : Nuclear engineering
Languages : en
Pages : 235
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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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: Jerome Spanier
Publisher:
ISBN:
Category : Monte Carlo method
Languages : en
Pages : 72
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Author: Pham Ngoc Son
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 0
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In the conventional neutron activation analysis, the elemental concentrations are normally determined from the comparison ratios between the measured specific activities of the sample and the standard reference material. An advantage in the comparison ratio method is that the systematic error due to neutron self-shielding and multi-scattering effects is canceled out, and the correction factors can be ignored but the preparation of reference standards to match the same conditions with those of various samples is the main difficulty. In the modern trend of neutron activation analysis, the K0-standardization method has been developed and applied in almost all the NAA laboratories. An important research work in the procedure under this method is the characteristic information regarding the neutron source, such as thermal and epithermal neutron fluxes, and epithermal spectrum shape-factor. These neutron spectrum parameters are experimentally determined by using the activation foils, in which the corrections for all neutron effects cause systematic errors should be taken into account. Using the MCNP5 code, a well-known Monte Carlo simulation program, the results of correction factors of thermal, epithermal and resonance neutron self-shielding factors for Au, Co, Mn, W activation foils are presented in this chapter.
Author: Ronaldus Martinus Wilhelmus Overwater
Publisher: Delft University Press
ISBN: 9789040710483
Category : Nuclear activation analysis
Languages : en
Pages : 177
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Author: Xiaogang Han
Publisher:
ISBN:
Category :
Languages : en
Pages : 128
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Keywords: PGNAA, Coincidence measurement, Monte Carlo, MCNP.
Author:
Publisher:
ISBN:
Category : Apologetics
Languages : en
Pages : 444
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Author: Sameer Sa Natto
Publisher:
ISBN:
Category : Aluminum
Languages : en
Pages :
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Author: William V. Baxter
Publisher:
ISBN:
Category : Monte Carlo method
Languages : en
Pages : 40
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