声明
摘要
ABSTRACT
Table of Content
List of Tables
List of Figures
Chapter 1 Introduction
1．1 Introduction of neutron measurements
1．2 Statement of the problem
1．3 Motivation of the study
1．4．1 General objective
1．4．2 Specific objectives
1．5 Significance of the study
1．6 Outline of this thesis
Chapter 2 Long counter detector
2．1 Introduction of detection status
2．2 Advantages of long counter
2．3 Applications of long counter
2．4 Limitations of long counter
2．5 Geometric part of long counter
2．5．1 Neutron moderator
2．5．2 Neutron absorber
2．5．3 Air holes or annular trough
2．5．4 Cadmium cover
2．5．5 Aluminum outer cover
2．6 Proportional counter 3He or BF3
2．6．1 The BF3 proportional counter
2．6．2 3He proportional counter
2．7 Electronic part of long counter
Chapter 3 Monte Carlo method
3．1 Introduction of SuperMC code
3．2 Application of SuperMC
3．3 Main Features of SuperMC code
3．3．1 Automatic Geometrical modeling
3．3．2 Results and process visualization
3．3．3 Cloud computing framework
3．4 Methodology of SuperMC simulation code
3．5 Validation and verification of SuperMC code
3．6 Scattering treatment in SuperMC
3．7 Nuclear data library
3．8 Variance reduction techniques
Chapter 4 Application of SuperMC on long counter design
4．1 Introduction
4．2 Design of an extended range long counter
4．2．1 Introduction
4．2．2 3He counter description
4．2．3 Geometry of initial design
4．2．4 Simulation process
4．2．5 Response function of long counter
4．2．6 Inserting metal target inside inner moderator
4．2．7 Lead and Chromium metal target
4．2．8 Conclusion
4．3 Design of reduced size long counter
4．3．1 Introduction
4．3．2 Theory of neutron detection using long counter
4．3．3 Materials and Methods
4．3．4 Results and Discussion
4．3．5 Conclusion
4．4 Design of response improved long counter
4．4．1 Introduction
4．4．2 Details of the geometry
4．4．3 Calculation of the response function
4．4．4 Neutron scattering
4．4．5 Conclusion
Chapter 5 Development and calibration of FDS-LC
5．1 Introduction
5．2 Material and method
5．2．1 Geometry of FDS-LC
5．2．2 Centrai thermal detector
5．2．3 Electronics and data acquisition system of FDS-LC
5．3 Experimental arrangements
5．3．2 Irradiation Hall
5．3．3 Correction of scattered neutrons
5．4 Results and Discussion
5．4．1 Validation of the response function of FDS-LC
5．4．2 Validation of the effective center
5．4．3 Calibration of FDS-LC
5．4．4 Measurements of angular response function
5．5 Uncertainty analysis
5．6 Conclusion
Chapter 6 Conclusion and Recommendations
6．1 Conclusion
6．2 Recommendations
References
Acknowledgement
List of Publications
