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      (An) experimental implementation of the 90° compton scattering inspection method for identifying explosive materials using dual energy X-ray = X-선 이중에너지 방법을 적용한 폭발물 검색용 90° 컴프턴산란 검색 실험 및 방법 연구

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      https://www.riss.kr/link?id=T12684823

      • 저자
      • 발행사항

        서울 : 한양대학교 대학원, 2012

      • 학위논문사항

        학위논문(박사) -- 한양대학교 대학원 , 원자력공학과 , 2012. 2

      • 발행연도

        2012

      • 작성언어

        영어

      • 주제어
      • 발행국(도시)

        서울

      • 형태사항

        xi, 92 p. : 삽도 ; 26 cm.

      • 일반주기명

        요지: p. 89-90
        Abstract: p. iv-v
        지도교수: 김종경
        References: p. 85-88

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        • 한양대학교 안산캠퍼스 소장기관정보
        • 한양대학교 중앙도서관 소장기관정보
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      다국어 초록 (Multilingual Abstract)

      In order to obtain the physical properties of an inspection object using an X-ray source, the energy-resolving X-ray method, reflecting the characteristic of continuous energy, is a very useful tool. In this study, the effective atomic number (Zeff) and normal density (ρ) obtained by the source weighting method on a dual energy X-ray inspection system are presented and demonstrated by experimental implementation. Two X-ray beams of the suggested method were designed using the XCOMP5r code. The filter design of a high energy X-ray source was fixed as 3.5 mm Sn at 150 kVp tube voltage, and the new high energy X-ray beam was named as IN150. The filter design of a low energy X-ray source was also fixed as 0.5 mm Sn at 90 kVp tube voltage, and the new beam was named as IN90. Benchmark calculations by MCNP simulation experiments were performed using four different materials, i.e., Polyethylene, Acetal, Urethane, and TNT. The results of the benchmark calculation showed that the new method can estimate the effective atomic number and the normal density of a scattered object accurately, even when the object was arbitrarily located in samples. Finally to verify the proposed new method, scattering experiments using various polymerized compounds were carried out. The effective attenuation coefficients ( , ) of the experiment objects at the source energies E1 and E2, were calculated using scattered spectra. The effective atomic number and the normal density were then calculated by using the ratio of to . As a result in case of all sample geometries, the relative differences between the calculation value and the reference value for the effective atomic numbers of each material were within 14 %, and the relative differences for the normal densities were within 12 %. This observation led us to the conclusion that the new 90° Compton scattering method for identifying explosive materials using a dual-energy X-ray is valid for calculating effective attenuation coefficients, effective atomic numbers, and normal densities in the X-ray inspection system.
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      In order to obtain the physical properties of an inspection object using an X-ray source, the energy-resolving X-ray method, reflecting the characteristic of continuous energy, is a very useful tool. In this study, the effective atomic number (Zeff) a...

      In order to obtain the physical properties of an inspection object using an X-ray source, the energy-resolving X-ray method, reflecting the characteristic of continuous energy, is a very useful tool. In this study, the effective atomic number (Zeff) and normal density (ρ) obtained by the source weighting method on a dual energy X-ray inspection system are presented and demonstrated by experimental implementation. Two X-ray beams of the suggested method were designed using the XCOMP5r code. The filter design of a high energy X-ray source was fixed as 3.5 mm Sn at 150 kVp tube voltage, and the new high energy X-ray beam was named as IN150. The filter design of a low energy X-ray source was also fixed as 0.5 mm Sn at 90 kVp tube voltage, and the new beam was named as IN90. Benchmark calculations by MCNP simulation experiments were performed using four different materials, i.e., Polyethylene, Acetal, Urethane, and TNT. The results of the benchmark calculation showed that the new method can estimate the effective atomic number and the normal density of a scattered object accurately, even when the object was arbitrarily located in samples. Finally to verify the proposed new method, scattering experiments using various polymerized compounds were carried out. The effective attenuation coefficients ( , ) of the experiment objects at the source energies E1 and E2, were calculated using scattered spectra. The effective atomic number and the normal density were then calculated by using the ratio of to . As a result in case of all sample geometries, the relative differences between the calculation value and the reference value for the effective atomic numbers of each material were within 14 %, and the relative differences for the normal densities were within 12 %. This observation led us to the conclusion that the new 90° Compton scattering method for identifying explosive materials using a dual-energy X-ray is valid for calculating effective attenuation coefficients, effective atomic numbers, and normal densities in the X-ray inspection system.

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      목차 (Table of Contents)

      • ABSTRACT iv
      • TABLE OF CONTENTS vi
      • LIST OF FIGURES ix
      • LIST OF TABLES xi
      • CHAPTER
      • ABSTRACT iv
      • TABLE OF CONTENTS vi
      • LIST OF FIGURES ix
      • LIST OF TABLES xi
      • CHAPTER
      • I. INTRODUCTION 1
      • 1.1 Background 1
      • 1.2 The State of The Art 2
      • 1.3 Goal and Scope of This Study 7
      • II. A REVIEW OF THE X-RAY INSPECTION SYSTEMS 8
      • 2.1 Conventional Dual Energy X-ray Inspection Method 8
      • 2.2 Computed Tomography Inspection Method 12
      • 2.3 Compton Scattering Inspection Methods 16
      • 2.3.1 Compton Backscattering Method 16
      • 2.3.2 Dual Energy Dual Beam 90° Compton Scattering Method 19
      • III. DEVELOPMENT OF THE NEW 90° COMPTON SCATTERING INSPECTION METHOD USING DUAL ENERGY X-RAY 23
      • 3.1 Criteria on Accuracy of 90° Compton Scattering Inspection Method Using Dual Energy X-ray 23
      • 3.2 Algorithm of the 90° Compton Scattering Method Using a Dual Energy X-ray 26
      • 3.2.1 Definition of the Effective Attenuation Coefficient 26
      • 3.2.2 Algorithm for Calculation of the Effective Atomic Number 28
      • 3.2.3 Algorithm for Calculation of Normal Density 30
      • 3.2.4 Calculation of Material Properties by Experimental Data 33
      • 3.3 Design of the Dual Energy X-ray Beam for the 90° Compton Scattering Method 38
      • IV. VERIFICATION OF 90°COMPTON SCATTERING METHOD USING DUAL ENERGY X-RAY 49
      • 4.1 Verification of the New Inspection Method Using MCNP Simulation 49
      • 4.2 Experimental Configuration for Verification of the New Inspection Method 51
      • 4.2.1 Configuration of the 90° Compton Scattering Experiment 51
      • 4.2.2 Correction of Experimental Data 55
      • 4.3 Verification of the New Inspection Method Using 90° Scattering Experiments 61
      • 4.3.1 Assessments for Material Identification Using Cubic Samples 61
      • 4.3.2 Assessments for Material Identification Using Actual Sample 75
      • V. CONCLUSIONS AND RECOMENDATIONS 80
      • 5.1 Conclusions 80
      • 5.2 Recommendations for Future Work 81
      • APPENDIX: Detail Derivation of the Effective Attenuation Coefficient 82
      • REFERENCE 85
      • ABSTRACT (in Korean) 89
      • ACKNOLOGEMENT 91
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