초록 ▼

￭ 대형 콤프턴 영상장치 설계 및 제반 기술 확립
- 대형 콤프턴 영상장치를 위한 섬광 물질 선정 및 검출기 구조 설계
- 방사성 물질의 분포 영상화를 위한 근거리 및 원거리 영상재구성 기술 개발
- Geant4 전산모사 기반의 콤프턴 영상장치 설계 및 성능 예측
￭ 대형 콤프턴 영상장치 구성 검출기 운용 기술 확보
- 통계적 알고리즘 기반의 위치 추정 방법론(MLPE) 개발
- 대면적 검출기 모듈의 특성 평가 연구 수행
- 다채널 PMT 신호처리를 위한 시분할 다중화 회로(MUX) 제작 및 시

￭ 대형 콤프턴 영상장치 설계 및 제반 기술 확립
- 대형 콤프턴 영상장치를 위한 섬광 물질 선정 및 검출기 구조 설계
- 방사성 물질의 분포 영상화를 위한 근거리 및 원거리 영상재구성 기술 개발
- Geant4 전산모사 기반의 콤프턴 영상장치 설계 및 성능 예측
￭ 대형 콤프턴 영상장치 구성 검출기 운용 기술 확보
- 통계적 알고리즘 기반의 위치 추정 방법론(MLPE) 개발
- 대면적 검출기 모듈의 특성 평가 연구 수행
- 다채널 PMT 신호처리를 위한 시분할 다중화 회로(MUX) 제작 및 시험
￭ 대형 콤프턴 영상장치 프로토타입 제작 및 평가
- FPGA 기반의 고속 디지털 신호처리 장치 제작 및 시험
- 대형 콤프턴 영상장치용 데이터 획득, 분석 및 제어 프로그램 개발
- 프로토타입 영상장치 제작 및 성능 평가

(출처 : 보고서 요약서 3p)

Abstract ▼

Ⅳ. Results
￭ Designing a large-scale Compton imaging device and establishment of fundamental technologies
- Design and selection of the proper scintillation detector for large-scale Compton imaging device
· Considering the performance and cost-effectiveness, a NaI(Tl) scintillator was se

Ⅳ. Results
￭ Designing a large-scale Compton imaging device and establishment of fundamental technologies
- Design and selection of the proper scintillation detector for large-scale Compton imaging device
· Considering the performance and cost-effectiveness, a NaI(Tl) scintillator was selected as a component of a large-area monolithic scintillation detector.
· 6×6 array design of square-shaped PMTs was selected to achieve the spatial resolution with a level of 1 cm.
- Development of near-field and far-field image reconstruction technique
· 3-D image reconstruction technique was developed for the near-field within 2-m-distance contamination.
· 3-D image reconstruction was also feasible for the far-field by using the Kinect, a range scanner equipment.
- Design and performance prediction of a Compton imaging device based on Geant4 Monte Carlo simulation
· A large-area monolithic scintillation detector was modelled in detail in Geant4.
· The effect of the main factors including energy resolution and spatial resolution on the Compton imaging device was estimated by using Geant4.
· A large-scale Compton imaging device was finally optimized, and the quantitative performances of the Compton imaging device were estimated.

￭ Development of detector control technology
- Development of interaction position estimation method based on statistical algorithm (MLPE)
· MLPE algorithm was developed to estimate the interaction position in the large-area monolithic scintillation detector.
· Geant4-based look-up table (LUT) generation method was developed.
· The spatial resolutions were evaluated to be below 1 cm for 59.6 keV, 662 keV, and 1173 keV gamma-rays collimated by a tungsten collimator with 3-mm-diameter hole.
- Characteristic study of large-area scintillation detector modules
· Energy calibration was carried out by using several check-sources.
· The energy resolution was evaluated to be 7.46% for 662 keV.
· The coincidence resolving time was evaluated to be 9.58 ns.
- Development of a time division multiplexer (MUX) for multi-channel signal processing
· MUX-based signal processing circuit was developed to reduce the number of DAQ channels while retaining all of signal information of 36 PMTs.
· By using MUX, the number of signal channels was reduced by about one-eighth, i.e, five channels for 36 PMTs.

￭ Development of a prototype model of the large-scale Compton imaging device
- Development of a high-speed digital signal processing circuit using FPGA
· High-speed FPGA-based DAQ system was developed to demultiplex and transfer the signal data to PC.
· A large-area monolithic NaI(Tl) scintillation detector system including the MUX-based signal processing circuit and FPGA-based DAQ system was developed.
· A dead time of the detector system was evaluated to be 10 μs.
- Development of an integrated program for the Compton imaging device
· An automatic energy calibration program was developed.
· User Interface (UI) program was developed by using MATLAB and C++.
· UI program was developed to reconstruct Compton images by obtaining and analyzing the signal data from the detector system and point cloud data from the Kinect V2.
- Performance evaluation of the prototype imaging device
· A prototype large-scale Compton imaging device was developed.
· The prototype has a size of 40 cm × 40 cm × 50 cm and weighs about 75kg.
· The power consumption of the prototype was evaluated to be 42.5 W in operation.
· The absolute image sensitivity of the prototype for ¹³⁷Cs at 1 m distance was evaluated to be 7.18 × 10^-5, and the image resolution was evaluated to be about 13° by simple back-projection and about 7° by post-processing, respectively.
· The feasibility of 3-D imaging of the prototype was also confirmed.

(출처 : SUMMARY 9p)

목차 Contents

• 표지 ... 1
• 제 출 문 ... 2
• 보고서 요약서 ... 3
• 요 약 문 ... 4
• SUMMARY ... 8
• CONTENTS ... 12
• 목차 ... 13
• 제1장 연구개발과제의 개요 ... 14
• 제 1 절 연구개발의 목적 ... 14
• 제 2 절 연구개발의 필요성 ... 14
• 제 3 절 연구개발의 범위 ... 17
• 제2장 국내외 기술개발 현황 ... 19
• 제 1 절 국내 연구개발 현황 ... 19
• 제 2 절 국외 연구개발 현황 ... 20
• 제3장 연구개발수행 내용 및 결과 ... 24
• 제 1 절 1차년도 연구수행내용 및 결과 ... 24
• 제 2 절 2차년도 연구수행내용 및 결과 ... 41
• 제 3 절 3차년도 연구수행내용 및 결과 ... 51
• 제4장 목표달성도 및 관련분야에의 기여도 ... 66
• 제5장 연구개발결과의 활용계획 ... 73
• 제6장 연구개발과정에서 수집한 해외과학기술정보 ... 76
• 제7장 연구장비의 구축 및 활용 결과 ... 78
• 제8장 참고문헌 ... 79
• 끝페이지 ... 81