초록 ▼

○ 냉 중성자 PGAA/NDP 분석 시스템 확립 및 PGI 측정기반 구축
- 즉발감마선 반동시 계수법 개발을 통한 바탕선 저감(1/10)과 TOF PGAA 시스템을 개발
- CN-PGAA 시스템의 측정능력을 평가함(B : 0.1 ppm 이하)
- 근표면 깊이별 원소분포(Neutron Depth Profile) 시스템의 분광계통 개선
- NDP를 이용한 주요원소에 대한 검출 한계 및 분석능력 평가(깊이분해능 37 nm)
- 즉발감마선 영상화 장치 개념 최적 설계를 위한 몬테카를로 전산모사
- 즉발감마선

○ 냉 중성자 PGAA/NDP 분석 시스템 확립 및 PGI 측정기반 구축
- 즉발감마선 반동시 계수법 개발을 통한 바탕선 저감(1/10)과 TOF PGAA 시스템을 개발
- CN-PGAA 시스템의 측정능력을 평가함(B : 0.1 ppm 이하)
- 근표면 깊이별 원소분포(Neutron Depth Profile) 시스템의 분광계통 개선
- NDP를 이용한 주요원소에 대한 검출 한계 및 분석능력 평가(깊이분해능 37 nm)
- 즉발감마선 영상화 장치 개념 최적 설계를 위한 몬테카를로 전산모사
- 즉발감마선 영상화 알고리듬 개발
○ 중성자 방사화 분석 복합 응용기술 개발
- 냉 중성자 PGAA의 표준물 분석의 정확도 10% 이내
- NAA 방법으로 고고학시료중의 주성분 및 희토류 원소 20여종을 분석 가능(정확도 15%)
- 국내 석조 문화재의 NAA 분석을 통한 자연과학적 산지 분류기법 확립
- 일반인과 치매환자의 혈청성분원소와 혈압, 혈당과의 성관성 평가 수행

(출처 : 보고서 요약서 3p)

Abstract ▼

Ⅳ. Results of the Project

1. Development of cold neutron prompt gamma activation analysis technique
○ Prompt gamma spectroscopy system was implemented and neutron flux (3x10⁸ n/cm²s) and mean wavelength (4.4 Å) of CG2B was measured. Background level was reduced to

Ⅳ. Results of the Project

1. Development of cold neutron prompt gamma activation analysis technique
○ Prompt gamma spectroscopy system was implemented and neutron flux (3x10⁸ n/cm²s) and mean wavelength (4.4 Å) of CG2B was measured. Background level was reduced to 1/10 by the development of anti-coincidence counting technique. In addition, establishment of CN-NIPS pair spectrometer was completed

○ Disc chopper was implemented using ⁶LiF neutron chopper and Al 6061 material , of which speed can be controlled upto 1800 rpm. As a result of TOF-PGAA performance test, time distribution of pulsed beam according to rotation speed of disk chopper and beam width was about 20 msec at 600 rpm

○ Detection limit was evaluated using Time-of-Flight PGAA system and analytical technique for short lived nuclides is developed using cyclic NAA

2. Development of analytical technique using Neutron Depth Profile system
○ Energy resolution and detection limit in the low energy region were improved by the reduction of noise of NDP system and of background gamma-rays. Depth resolution of prompt charged particles emitted from ¹⁰B in a Si wafer was evaluated to be 37 nm and spectroscopy system and circuit composition for Time-of-Flight NDP system was designed.

○ Area density of ¹⁰B in NIST SRM-2137 was analyzed to be 1.047×10¹⁵ atoms/cm² using NDP system and the difference of certified value of NIST was 2.8%. When compared to international NDP facility, detection limit of KAERI-NDP is placed in the middle level. When compared to detection limit of other analytical techniques, NDP is higher sensitivity than AES, XRD, RBS, XRF, however, is lower than SIMS

○ In order to analytical protocol for the analysis of semiconductor and secondary battery applying NDP, TOF-NDP spectrometer system was composed and measurement capability was examined

3. Development of prompt gamma imaging instrument
○ For optimum conceptual design of prompt gamma imaging instrument, simulation of prompt gamma-rays for Cl was carried out on the basis of PGI concept using a single detector. In addition, detection limits for B, Cd, Sm, Gm, etc. were expected and evaluated

○ Design concept for prompt gamma imaging was developed, which is similar to detection sensor using multi ring PET and triple head gamma camera. In addition, gamma-ray yield for S, Ca, N, Hg was evaluated under the coincidence detection condition of two detectors by 10⁶ thermal neutrons using one dimensional position detecting simulation using MCNP/GEANT code.

○ For the realization of cold neutron prompt gamma imaging technology through manufacturing PGI instrument and developing PGI technology, two dimensional simulation using MCNP/GEANT code was executed

4. Development of application technologies using integrated neutron activation analysis
○ For the evaluation of applicability for the certification of reference materials using PGAA, analytical protocol was established for the quantification of PGAA and 10 elements were determined from NIST SRMs. The accuracy of PGAA results is within 10% of relative error by the comparison of certified values of NIST SRMs

○ For the determination of rare earth elements in archaeological samples using integrated NAA, CN-PGAA can detect Si, one of major element, and B, Cd, Cl, sensitive elements of PGAA and Gd, Sm, rare earth elements. As analytical results of NIST SRM 1646a-Esturine Sediment by CN-PGAA, relative error is within 15%. In addition, INAA can analyze major elements and Ce, Dy, Eu, La, Lu, Nd, Sc, Sm from archaeological samples

○ To perform provenance study of domestic stone cultural heritage, 38 samples were collected and analyzed by NAA. For analytical quality control, NIST SRM 2711-Montana Soil was analyzed as a control material. The analyzed data are statistically treated using principal component analysis and provenance classification technique by natural science was established

○ Blood samples were collected from normal person and dementia patients and serum samples were separated from the blood samples and prepared for NAA by freeze-drying. Interesting elements such as Ca, Na, Fe, Se, Zn were analyzed by NAA. Correlation between elements in serum and blood pressure and blood sugar from normal person and dementia patients was evaluated

(출처 : SUMMARY 9p)

목차 Contents

• 표지 ... 1
• 제 출 문 ... 2
• 보고서 요약서 ... 3
• 요 약 문 ... 4
• SUMMARY ... 8
• CONTENTS ... 12
• 목차 ... 13
• 표목차 ... 14
• 그림목차 ... 15
• 제 1장 연구개발과제의 개요 ... 19
• 제 1절 연구개발의 목적 및 필요성 ... 19
• 제 2절 연구개발의 내용 및 범위 ... 21
• 제 2장 국내외 기술개발 현황 ... 24
• 제 1절 국내 기술개발 현황 및 수준 ... 24
• 제 2절 국외 기술개발 현황 및 수준 ... 25
• 제 3장 연구개발 수행내용 및 결과 ... 27
• 제 1절 냉 중성자 즉발 감마선 방사화 분석 기술 개발 ... 27
• 제 2절 근표면 깊이별 원소분포 측정기술 개발 ... 48
• 제 3절 즉발 감마선 영상화 장치 개발 ... 91
• 제 4절 중성자 방사화 분석 복합 응용기술 개발 ... 104
• 제 4장 목표달성도 및 관련분야에의 기여도 ... 144
• 제 1절 목표 달성도 ... 144
• 제 2절 관련분야에의 기여도 ... 146
• 제 5장 연구개발결과의 활용계획 ... 148
• 제 6장 연구개발과정에서 수집한 해외과학기술정보 ... 149
• 제 7장 참고문헌 ... 150
• 끝페이지 ... 151