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진해지구공업용수용 전동기및 기동보 상기 성능시험에 관한 보고
우형주(Hyung Joo Woo) 대한전기학회 1967 전기의 세계 Vol.16 No.3
본보고는 건설부에서 국산품에 대한 대용량전동기로서는 최초의 성능시험인 점에서 의의가 있다고 보며 제일차분에 비해 개선된 점이 많은 제2차분만을 취급하기로 한다.
환경시료중의 방사성탄소 측정을 위한 $CO_2$ 직접흡수법의 최적화 연구
조수영,우형주,천상기,Cho, Soo-Young,Woo, Hyung-Joo,Chun, Sang-Ki 대한방사선방어학회 1998 방사선방어학회지 Vol.23 No.4
생체나 공기 등 일반 환경시료의 방사성탄소 측정을 위한 액체섬광측정기술의 최적화에 연구의 목적을 두었다 일반 환경시료의 경우 $CO_2$ 직접흡수법을 적용하였으며, 이산화탄소 흡수제 Carbosorb $E^{TM}$와 섬광용액 Permafluor $V^{TM}$기 혼합비율을 1:1로 결정하였다. 이 20 ml 혼합용액에 포화 흡수되는 이산화탄소의 양은 평균 2.35 g 이며, 포집에 소요되는 시간은 약 40 분이었다 백그라운드 계수율은 1.88±0.06 cpm 이었으며, NIST 옥살산표준시료 측정결과 계측효율은 58.8±1.4 % 이었다. 이산화탄소 흡수량에 따른 계측효율을 보정하기 위하여 소광보정곡선을 구하였다. 자연준위 시료의 경우 4시간 계측시 비방사능 측정에 따른 전반적인 오차는 95 % 신뢰도상 약 7 %이었다. 이 측정방법에 대하여 2주 동안 시료의 안정성을 조사한 결과 계측효율과 백그라운드 계수율의 안정성을 의심할 만한 현상은 발견되지 않았다. The goal of this work was to optimize the liquid scintillation counting techniques for the determination of C-14 in environmental samples such as biological and air samples. Carbon-14 activities in most environmental samples were measured with direct $CO_2$ absorption method. The highest figure of merit was found through the variation of Carbosorb $E^{TM}$ and Permatluor $V^{TM}$ ratio, in the measurement windows. The best condition was 1:1 volume ratio. Average 2.35 g of $CO_2$ was reproducibly absorbed in the 20 ml mixture within 40 min. The counting efficiency determined by repeated analysis of NIST oxalic acid standard and the background count rate were measured to be $58.8{\pm}1.4%$ and $1.88{\pm}0.06\;cpm$, respectively in case of saturated solution. The correction curves of counting efficiency for partially saturated solutions and for saturated solutions with quenching were prepared, respectively. The overall uncertainty of the sample specific activity for near background levels was estimated to be about 7 % for 4 hours counting at 95 % confidence level. The long-term stability of samples has been checked for all the counting techniques over a two week periods, and no apparent change in counting efficiency and background level was found at that time.
김낙배,우형주,홍완,조수영,Kim, Nak Bae,Woo, Hyung Joo,Hong, Wan,Cho, Soo Young 한국분석과학회 1992 분석과학 Vol.5 No.4
액체섬광계수법을 방사성탄소 연대측정에 이용하기 위하여 섬광용액과 섬광용액 대 벤젠의 부피비, 그리고 베타선 스펙트럼 측정범위를 변화시키면서 삼중수소의 영향을 최소화하고 최대 FOM을 얻기 위한 저준위 액체섬광계수기의 최적계측조건을 결정하였다. 결정된 조건하에서 백그라운드 계수율을 $2.26{\pm}0.03cpm$ 까지 낮출 수 있었으며, 이때의 최대 측정가능 연대는 약 40,000년에 이르렀다. 또한 고개시료 및 토탄시료 등의 실제시료에 적용하여 측정계의 실용성을 확인하였다. Optimum counting condition of a low level liquid scintillation counter for radiocarbon dating has been determined to minimize the contribution of tritium activity and get the highest FOM by the variation of scintillation solutions, scintillation solution to benzene ratio, and ${\beta}$-ray spectrum counting ranges. Under the condition, background count rate has been reduced to $2.26{\pm}0.03cpm$, and the maximum measurable age reached to about 40,000 years. And the practicality of counting system has been verified by the analysis of shell and peat samples.
김경자(Kim Kyeong-Ja),홍완(Hong Wan),박중헌(Park Jung-Hun),우형주(Woo Hyung-Joo) 역사실학회 2007 역사와실학 Vol.32 No.-
Abstract Beryllium-l0(<SUP>10</SUP>Be) is produced not only in the atmosphere of the Earth but also the crust of the Earth. Also its half-life(Tl/2=1.5 million years) is long enough so that it takes at least 15 million years in order to remove the <SUP>10</SUP>Be completely after its production. Because of these merits, after accelerator mass spectrometry system has been developed in the late 1970s, <SUP>10</SUP>Be has been widely used in the research areas of geology, oceanography, geomorphology, and atmospheric sciences as one of important tracers as well as a dating tool. Nowadays, <SUP>10</SUP>Be is used as an important tracer in archaeology, and the trend of its usage is increasing worldwide. In the studies of archaeology, especially ¹?Be research projects associated with surface exposure dating and dating of paleosol are increasing worldwide. Newly introduced the AMS system of KIGAM(Korea Institute of Geoscience and Mineral Resources) will be able to measure not only radiocarbon but also Beryllium-l0 and Aluminium-26, which are essential in geomorphological studies and other important research areas. This paper demonstrates the production mechanism of the atmospheric <SUP>10</SUP>Be and in situ-produced <SUP>10</SUP>Be on the Earth, and some examples of <SUP>10</SUP>Be researches associated with archaeology as well as prospective archaeological research applications of <SUP>10</SUP>Be in Korea.