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Determination of 14C in Environmental Samples Using CO₂Absorption Method
Kim,Cheol-Su,Rho,Byung-Hwan,Lee,Sang-Kuk,Kim,Yong-Jae,Kim,Chang-Kyu 대한방사선 방어학회 1997 방사선방어학회지 Vol.22 No.1
CO₂흡수제와 액체섬광계수기를 이용하여 간단하고 정밀한 14C 정량법을 개발하였다. 또한, 대기 및 생물시료중 3H 및 14C 동시포집을 위한 대기시료 포집장치 및 연소장치를 개발하였다. 본 연구에서 개발한 대기중 CO₂포집장치의 포집율은 73-89%였으며 연소장치의 연소율은 98%를 나타내었다. 측정시료 조제시 흡수제와 섬광체와의 최적 혼합비는 1:1 였으며 측정시료중 14C의 비방사능 농도는 시료조제후 70일 까지 변화하지 않고 매우 안정한 상태를 유지하였고 검츨하한치는 0.025 Bq/gC로써 자연준위의 14C 분석에도 활용가능하였다. 도한, 본 분석법에 의한 14C 분석결과는 벤젠합성법에 의한 결과와 ±6% 오차범위내에서 상호간 잘 일치하였다. 본 연구에서 검토한 방법을 이용하여 1996년 10월 대전지역 대기중 14C의 비방사능을 측정한 결과 0.26-0.27Bq/gC의 범위로서 전형적인 자연준위를 나타내었다. 한편, 월성 원자력발전소로부터 1km 떨어진 지점에서의 대기중 14C의 비방사능은 0.54±0.03 Bq/gC였으며, 솔잎 및 채소류중 14C의 비방사능은 각각 0.56-0.67 Bq/gC 및 0.23-1.41 Bq/gC의 농도범위를 나타내었다. A simple and precise method of 14C was developed to analyze 14C in the environment samples using a commercially available 14CO₂ absorbent and a liquid scintillation counter. An air sampler and a combustion system were developed to collect HTO and 14CO₂in the air and the biological samples simultaneously. The collection yield of 14CO₂by the air sampler was in the range of 73-89%. The yield of the combustion system was 97%. In preparing samples for counting, the optimum ratio of CO₂absorbent to the scintillator for mixing was 1:1. No variation of the specific activity of 14C in the counting sample was observed up to 70 days after preparation of the samples. The detection limit for 14C was 0.025 Bq/gC, which is the level applicable to the natural level of 14C. The analytical result of 14C obtained by the present method were within ±6% of the relative error from the one by the benzene synthesis. The specific activity of 14C in the air collected at Taejon during the period of October 1996 ranged from 0.26 to 0.27 Bq/gC. The specific activity of ??C in the air collected at 1km from the Wolsong nuclear power plant, a 679 MWe PHWR, was 0.54±0.03 Bq/gC. The ranges of specific activities of 14C in the pine needles and the vegetations from the areas around the Wolsong nuclear power plant were 0.56-0.67Bq/gC and 0.23-1.41 Bq/gC, respectively.
$Co_2$ 흡수법에 의한 환경시료중 $^{14}C$ 정량
이상국,김창규,김철수,김용재,노병환,Lee, Sang-Kuk,Kim, Chang-Kyu,Kim, Cheol-Su,Kim, Yong-Jae,Rho, Byung-Hwan, 대한방사선방어학회 1997 방사선방어학회지 Vol.22 No.1
$CO_2$ 흡수제와 액체섬광계수기를 이용하여 간단하고 정밀한 $^{14}C$ 정량법을 개발하였다. 또한, 대기 및 생물시료중 $^3H$ 및 $^{14}C$ 동시포집을 위한 대기시료 포집장치 및 연소장치를 개발하였다. 본 연구에서 개발한 대기중 $CO_2$ 포집장치의 포집율은 73-89%였으며 연소장치의 연소율은 97%를 나타내었다. 측정시료 조제시 흡수제와 섬광체와의 최적 혼합비는 1:1 였으며 측정시료중 $^{14}C$의 비방사능 농도는 시료조제 후 70일까지 변화하지 않고 매우 안정한 상태를 유지하였고 검출하한치는 0.025 Bq/gC로써 자연준위의 $^{14}C$ 분석에도 활용 가능하였다. 또한, 본 분석법에 의한 $^{14}C$ 분석결과는 벤젠합성범에 의한 결과와 ${\pm}6%$ 오차범위 내에서 상호간 잘 일치하였다. 본 연구에서 검토한 방법을 이용하여 1996년 10월 대전지역 대기중 $^{14}C$의 비방사능을 측정한 결과 0.26-0.27 Bq/gC의 범위로써 전형적인 자연준위를 나타내었다. 한편, 월성 원자력발전소로부터 lkm 떨어진 지점에서의 대기중 $^{14}C$C 비방사능은 $0.54{\pm}0.03$ Bq/gC였으며, 솔잎 및 채소류중 $^{14}C$의 비방사능은 각각 0.56-0.67 Bq/gC 및 0.23-1.41 Bq/gC의 농도범위를 나타내었다. A simple and precise method of $^{14}C$ was developed to analyze $^{14}C$ in the environment samples using a commercially available $^{14}CO_2$ absorbent and a liquid scintillation counter. An air sampler and a combustion system were developed to collect HTO and $^{14}CO_2$ in the air and the biological samples simultaneously. The collection yield of $^{14}CO_2$ by the air sampler was in the range of 73-89% . The yield of the combustion system was 97%. In preparing samples for counting, the optimum ratio of $CO_2$ absorbent to the scintillator for mixing was 1:1. No variation of the specific activity of $^{14}C$ in the counting sample was observed up to 70 days after preparation of the samples. The detection limit for$^{14}C$ was 0.025 Bq/gC, which is the level applicable to the natural level of $^{14}C$. The analytical result of $^{14}C$ obtained by the present method were within ${\pm}6%$ of the relative error from the one by the benzene synthesis. The specific activity of $^{14}C$ in the air collected at Taejon during the period of October 1996 ranged from 0.26 to 0.27 Bq/gC. The specific activity of $^{14}C$ in the air collected at 1km from the Wolsong nuclear power plant a 679 MWe PHWR, was $0.54{\pm}0.03$ Bq/gC. The ranges of specific activities of $^{14}C$ in the pine needles and the vegetations from the areas around the Wolsong nuclear power plant were 0.56-0.67 Bq/gC and 0.23-1.41 Bq/gC, respectively.
유종한,Jae-Ho Shin,Min Sung An,Tae Kwun Ha,Kwang Hee Kim,배기범,Tae Hyeon Kim,최창수,Kwan Hee Hong,Jeong Kim,정수진,Sun Hee Kim,Kuk Hwan Rho,김종태,양영일 대한대장항문학회 2012 Annals of Coloproctolgy Vol.28 No.3
Purpose: This experimental study verified the effect of adipose-tissue-derived stem cells (ASCs) on the healing of ischemic colonic anastomoses in rats. Methods: ASCs were isolated from the subcutaneous fat tissue of rats and identified as mesenchymal stem cells by identification of different potentials. An animal model of colonic ischemic anastomosis was induced by modifying Nagahata’s method. Sixty male Sprague-Dawley rats (10-week-old, 370 ± 50 g) were divided into two groups (n = 30 each): a control group in which the anastomosis was sutured in a single layer with 6-0 polypropylene without any treatment and an ASCtreated group (ASC group) in which the anastomosis was sutured as in the control group, but then ASCs were locally transplanted into the bowel wall around the anastomosis. The rats were sacrificed on postoperative day 7. Healing of the anastomoses was assessed by measuring loss of body weight, wound infection, anastomotic leakage, mortality, adhesion formation,ileus, anastomotic stricture, anastomotic bursting pressure, histopathological features, and microvascular density. Results: No differences in wound infection, anastomotic leakage, or mortality between the two groups were observed. The ASC group had significantly more favorable anastomotic healing, including less body weight lost, less ileus, and fewer ulcers and strictures, than the control group. ASCs augmented bursting pressure and collagen deposition. The histopathological features were significantly more favorable in the ASC group, and microvascular density was significantly higher than it was in the control group. Conclusion: Locally-transplanted ASCs enhanced healing of ischemic colonic anastomoses by increasing angiogenesis. ASCs could be a novel strategy for accelerating healing of colonic ischemic risk anastomoses.
Anastomotic Sealing Effect of Tissue Adhesives on Technical Failure of Colonic Anastomosis
Tae Doo Jung,Jung Min Kim,Jae Ho Shin,Min Sung An,Tae Geun Ha,Kwang Hee Kim,Ki Beom Bae,Tae Hyeon Kim,Chang Soo Choi,Kwan Hee Hong,Soo Jin Jung,Sun-Hee Kim,Kuk Hwan Rho 대한외과학회 2011 대한외과학회 학술대회 초록집 Vol.2011 No.11
Comparison of Various Antiadhesives for Preventing Postoperative Severe Adhesion Formation
Hyo Jun Hwang,Jung Min Kim,Jae Ho Shin,Min Sung An,Tae Geun Ha,Kwang Hee Kim,Ki Beom Bae,Tae Hyeon Kim,Chang Soo Choi,Kwan Hee Hong,Soo Jin Jung,Sun-Hee Kim,Kuk Hwan Rho 대한외과학회 2011 대한외과학회 학술대회 초록집 Vol.2011 No.11