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실리콘 PIN 다이오드 검출기를 이용한 전자선량계 개발
이봉재,김봉환,장시영,김종수,Lee, B.J.,Kim, B.H.,Chang, S.Y.,Kim, J.S. 대한방사선방어학회 2000 방사선방어학회지 Vol.25 No.4
실리콘 PIN 다이오드 검출기를 이용하여 전자선량계(PED)를 설계 및 제작하고, 전자신호회로의 성능과 방사선 검출 반응특성을 평가하였다. 전자회로의 성능검사에서는 방사선에 의한 검출기의 신호가 신호처리회로에서 양호하게 출력되었으며, $^{137}Cs$ 감마 방사선을 이용한 방사선조사 시험결과 선량계의 반응도 및 분산계수는 각각 1.85 cps/$Gy{\cdot}h^{-1}$ 및 19.3%로 측정되어 전자선량제의 성능기준을 만족하는 것으로 나타났다. 본 전자선량계의 시작품은 향후 전자회로의 성능향상과 작동 프로그램을 보완 및 개선함으로써 개인 방사선 모니터링에 활용될 것으로 기대된다. A prototype electronic dosimeter(PED) adopting a silicon PIN diode detector as a radiation detector has been developed, manufactured and test-evaluated. A radiation signal processing circuit has been electronically tested and then the radiation detection characteristics of this PED has been performance-tested by using a reference photon radiation field. As a result in a electronic performance test, radiation signals from a detector were well observed in the signal processing circuit. The radiation detection sensitivity of this PED after several test-irradiations to $^{137}Cs$ gamma radiation source appeared to be 1.85 cps/$Gy{\cdot}h^{-1}$ with 19.3% of the coefficient of variation, which satisfied the performance criteria for the active personnel radiation monitor. Further improvement of the electronic circuit and operating program will enable the PED to be used in personal monitoring purpose.
TRIGA Mark-II, III 연구로 시절의 폐로를 위한 시설의 잔류 방사선/능 평가
이봉재,장시영,박승국,정운수,정기정,Lee, B.J.,Chang, S.Y.,Park, S.K.,Jung, W.S.,Jung, K.J. 대한방사선방어학회 1999 방사선방어학회지 Vol.24 No.2
TRIGA Mark-II, III 연구로를 폐로함에 따라, 원자로를 비롯한 관련 시설로부터 작업자의 방사선피폭을 최소화하고 환경으로의 방사성물질 누출을 사전에 방지하며, 안전한 해체방법을 모색하여 해체공사시의 기술기준을 수립하기 위하여 해체대상 시설내에 잔존하고 있는 방사성물질의 방사선/능 준위를 측정 및 분석 평가하였다. 측정대상은 시설내의 바닥 및 벽면과 잔존 실험시설물의 표면, 수조내 방사화 물질의 표면, 시설내 잔존하고 있는 냉각수 등이다. 이들 측정대상에 대한 방사선량율과 표면오염도, 핵종 등을 측정, 분석 및 평가하였다. 또한 전산코드 Fispin 을 사용하여 원자로 수조내의 주요 방사화 물질에 대한 방사능양과 핵종을 평가하였다. 본 평가 결과는 해체계획서 작성시 기본자료로서 유용하게 사용되었다. Residual radiation and radioactivity level in TRIGA Mark-II, III research reactors and facilities at the KAERI Seoul site, which are to be decommissioned, have been measured, analyzed and evaluated to know the current status of radiation and radioactivity level and to establish and to provide the technical requirements for the safe decommissioning of the facilities which shall be applied in minimizing the radiation exposure for workers and in preventing the release of the radioactive materials to the environment. Radiation dose rate and surface radioactivity contamination level on the experimental equipments, floors, walls of the facilities, and the surface of the activated materials within the reactor pool structure were measured and evaluated. Radioactivity and radionuclides in the pool and cooling water were also analyzed. In case of the activated reactor pool structures which are very difficult to measure the radiation and radioactivity level, a computer code Fispin was additionally used for estimation of the residual radioactivity and radionuclides. The radiation and radioactivity data obtained in this study were effectively used as basic data for decontamination and dismantling plan for safe decommissioning of TRIGA Mark-II, III facilities.
강태홍(T . H . Kang),이상철(S . C . Lee),이봉재(B . J . Lee) 한국축산학회 1988 한국축산학회지 Vol.30 No.6
To make up $quot;The Composition of Korean Feedstuffs$quot; published in 1981, investigation was carried out for digestible nutrients of feedstuffs using Korean native cattle. The results obtained from 1984 to 1986 are as follows. Digestible crude protein value of alfalfa pellet was similar with alfalfa cube, but alfalfa pellet was lower than alfalfa cube in TDN and DE value. Corn gluten meal was higher than corn gluten feed in all digestible nutrients. Among the silages of barley, corn and rye, DCP content in the rye was higher than in the barley and corn, and TDN and DE value was the highest in the corn. More work for wheat bran pellet is required because TDN was lower as compared with wheat bran data published before.
박승광 ( S. K. Park ),유수웅 ( S. W. You ),이봉재 ( B. J. Lee ),성락훈 ( L. H. Sung ) 대한내과학회 1972 대한내과학회지 Vol.15 No.2
The purpose of this report is to illustrate the long course and rarity of C.L.L. in Korea. This is the first case of C.L.L. among 107 all leukemia during the past 10 years in National Medical Center. Variation in the incidence of C.L.L. are compared to oth
볏짚의 사료가치 증진을 위한 연구 1 . 암모니아 처리시 저장방법에 따른 사료가치비교
강태홍(T . H . Kang),차영호(Y . H . Cha),이봉재(B . J . Lee) 한국축산학회 1987 한국축산학회지 Vol.29 No.2
This experiment was conducted to compare storage methods of straws for the treatment of ammonia in relation to the digestible nutrients and economical efficiency. Straws were treated with 3% anhydrous ammonia (DM basis) in stack, wire mesh (panel) silo, and oven. Metabolism trial was conducted with sheep for the determination of digestible nutrients. The following results were obtained: 1. Crude protein content was 7.49% in untreated rice straw and increased 2 times (14.71-16.04%) after ammonia treatment, while digestible crude protein contents were increased from 2.86% to 7.82-8.30% by NH₃-treatment. 2. Lignin nd cell wall contents were also decreased from 9.35. to 6.79-7.59% and from 77.19 to 72.91-73.89%, respectively, by the NH₃ treatment, but the treatment effect was less than in crude protein contents. 3. Total digestible nutrient contents were increased about 1.5 times (57.65%-61.44% vs. 41.26%) by the NH₃-treatment, but there was no any significant difference-among the storage methods. 4. Ammonia treatment of rice straw in was the least expensive of the three methods in producing a unit TDN.