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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.
A Study on the Neutron Activation Analysis for the Determination of Mercury in Biological Samples
이철,김낙배,이인종,Lee Chul,Kim, Nak Bae,Lee Ihn Chong Korean Chemical Society 1975 대한화학회지 Vol.19 No.3
쌀, 생선 및 표준 기준 배추시료 속에 함유된 수은의 함량을 두 개의 독립적인 분석 방법 즉, 과거 본 연구실에서 개발한 방법과 Sjostrand 방법에 의하여 분석하였다. 분석 결과는 시료의 종류에 따라서 서로 다른 매트릭스 효과를 보였다. 예를 들면 배추과 생선 시료는 같은 매티릭스 효과를 나타내었으나 쌀 시료는 이 두 종의 시료과 비교하여 다른 효과를 보였다. Rice and fish samples as well as a standard reference kale sample have been analyzed for the mercury content using two independent methods, i.e., one developed previously in this laboratory and the other reported by Sjostrand. The analytical results indicate differences in matrix effects depending on the type of sample, e.g., kale and fish samples show the same matrix effects, whereas rice samples show different effects compared to others.
Neutron Activation Analysis of Korean Clays and Pottery
이철,권오천,김낙배,Lee Chul,Kwun Oh Cheun,Kim Nak Bae,Lee Ihn Chong Korean Chemical Society 1985 Bulletin of the Korean Chemical Society Vol.6 No.4
Twenty trace elements were determined in 250 Korean potsherds and 5 clay samples by instrumental NAA. In the absence of identified samples of known origin, the potsherds were classified by a hierarchical centroid sorting method to construct a dendrogram. From this dendrogram 61 well-defined samples were selected to form 8 subclasses and five elements such as Cr, Cs, Sm, Sc and Th were supposed to be the main contributors for the classification. The 61 samples along with 5 clay samples were reclassified by means of minimal spanning tree as well as the hierarchical centroid sorting method by using 5 elements selected. As the results, the potsherds of certain classes defined in this work could be taken as a basis for latter identification and served as batches of identified species.