• Proceedings of the Korean Radioactive Waste Society Conference
• /
• 2004.06a
• /
• pp.232-232
• /
• 2004

우라늄 변환시설 내의 라군 슬러지의 처리를 위해 슬러지의 물 첨가 용해를 실시하고, 여과후 발생한 질산염의 안정적 처리를 위한 열분해를 실시하였다. 라군 슬러지의 질산염 및 우라늄 제거공정은 후속처리공정에서의 부담을 최소화 할 수 있도록 1.5배의 물을 첨가 용해하였으며, 두 개의 라군에 저장된 슬러지 처리방법의 효율성 평가를 위하여 각 라군의 개별적, 혹은 혼합하여 실험을 실시하였다.(중략)

• Proceedings of the Korean Radioactive Waste Society Conference
• /
• 2004.06a
• /
• pp.245-245
• /
• 2004

현재 한국원자력 연구소에서 개발되고 있는 사용후 핵연료의 차세대관리기술은 산화물 핵연료를 전해환원시켜 금속으로 관리하는 기술이다. 이 공정에서 발생된 LiCl 폐용융염은 Cs, Sr과 같은 핵분열 생성물을 함유하고 있으며, 그 자체로서 수용성이고 방사선에 분해가 잘 되므로 처분 수용기준에 맞게 안정화시켜 처리해야 한다. 현재 이를 처리하기 위한 방법으로 고온에서도 핵분열 생성물의 이온교환 및 흡착이 가능한 제올라이트 A를 이용한 이온교환 및 단순혼합 방식이 주로 적용되고 있다.(중략)

• Proceedings of the Korean Radioactive Waste Society Conference
• /
• 2010.10a
• /
• pp.129-130
• /
• 2010

• Proceedings of the Korean Radioactive Waste Society Conference
• /
• 2012.10a
• /
• pp.259-260
• /
• 2012

• Proceedings of the Korean Radioactive Waste Society Conference
• /
• 2016.10a
• /
• pp.279-280
• /
• 2016

• Journal of Radiation Protection and Research
• /
• v.20 no.4
• /
• pp.237-243
• /
• 1995

An estimate is made on the potential generation rate of H: from radiolysis of the Paraffin-wax encapsulant Proposed for the solidified liquid concentrate wasteform. The results show that the radiolytic Production of $H_2$ from paraffin-wax-encapsulated waste is dominated by the radiation energy released from $^{60}Co$. The radiolytic production of $H_2$ will proceed at an initial rate equivalent to aproximately $4.4{\times}10^2cm^3yr^1$ in 200 litre drums that are partly filled with 120 litres of encapsulated waste. The gas production rate will fall to a value of $7.2cm^3yr^1$ after 100 years. The lower flammable limit for $H_2$ in air will be reached in about 25 years and the lower explosive limit for $H_2$ in air would not be reached in 1000years. The timescale in which these safety-related limits are reached is strongly dependent on the level of filling of each waste drum. A reduction of the air space inside each drum would reduce the time required to reach the lower flammable limit.

• Korean Journal of Microbiology
• /
• v.28 no.2
• /
• pp.162-168
• /
• 1990

The aims of the present study were to evaluate the effects of culture conditions on the biosynthesis of extra-cellular alkaline protease in Streptomyces sp. The formation of aerial mycelia and spores were compared with the protease production in order to know the relations between the alkaline protease and the cell differentiation. As results, it was found that substrate concentration was very critical to regulate the formation of the protease, aerial mycelia, and spores, which were resulted from the changes of culture pH to acid. When the culture pH was adjusted with phosphate buffer from pH 6 to pH 9, the alkaline protease production was increased as the culture pH increased whereas aerial mycelia and spore formation were reversely related to the culture pH. Therefore, it was thought that the culture pH was an important factor to regulate the alkaline protease synthesis.

• Proceedings of the Korean Radioactive Waste Society Conference
• /
• 2003.11a
• /
• pp.632-635
• /
• 2003

For the disposal of low-level radwaste from nuclear power plant need the determination of levels of radio nuclides in radwaste. These nuclides include the difficult-to-measure nuclides, so indirect methodology for the determination of the difficult-to-measure nuclides have to be developed. In this work, for the determination of $^129I(t_{1/2}=1.57{\times}10^7 years)$ in low-level radwaste from nuclear power plant is investigated. Recovery of Iodide in simulated waste($UO_2$ pellet) as a soluble and radwaste(resin, woolen fabric)as a insoluble samples are measured. After pretreatment of sample, $I_2$ are extracted from aqueous solution with $CCl_4$. Then I are extracted from $CCl_4$ with 0.1M $NaHSO_3$ aqueous solution. iodide in aqueous solution are determined by ion chromatography. The overall recovery yield is 76.7 (RSD 1.7%) for mixed-acid digestion method. Incase of woolen fabrics, overall recovery yield is 74.3 (RSD 2.2%) and recovery of iodide in resin 56.5(RSD 5.6%) for alkaline fusion method.

• Journal of Radiation Protection and Research
• /
• v.17 no.1
• /
• pp.1-10
• /
• 1992

A number of investigators have reported the formation of the radiolytic ultrafine particles produced by the interaction of ionizing radiation with water vapor. Previous studies have suggested that a very high localized concentration of the OH radical produced by the radiolysis of water can react with trace gas like organic vapors and produce lower vapor pressure compounds that can then nucleate. In order to determine water vapor dependence of the active, positively charged, first radon daughter(Po-218), an experiment was conducted using a well-controlled radon chamber. The activity size distribution of the radon daughter in the range of 0.5-100nm was measured using the parallel graded wire screens system. Measurements were taken for different relative humidity. The resultant activity size distributions were analyzed. The addition of water vapor to the radon carrier gases resulted in the formation of ultrafine particles by OH radicals formed by radon radiolysis. It may be due to the neutralization of charged Po-218 ion with water vapor through the radio lysis.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2012.08a
• /
• pp.273-273
• /
• 2012

컷오프 진단법은 두 개의 탐침 형태로 제작된 마이크로 웨이브 진단법으로, 간단한 수식을 통해 전자밀도, 전자온도 등을 측정할 수 있다. 컷오프 탐침은 방사 안테나, 측정 안테나와 네트워크 분석기로 구성되어 있다. 네트워크 분석기는 두 안테나 사이의 플라즈마 투과 스펙트럼을 만드는데 쓰이며, 스펙트럼 분석을 통해 플라즈마 변수들을 측정할 수 있다. 이 진단법은 장치나 분석방법이 매우 간단한 장점을 지니며, 약 1 mW 정도의 적은 파워를 사용하여 플라즈마 상태를 거의 변화시키지 않는 측정이 가능하다. 또한 CF4와 같은 공정 가스를 이용한 플라즈마에서도 사용이 가능하다. 그러나 컷오프 진단법을 사용한 측정은 다른 종류의 진단법과 마찬가지로, 약 1초 정도의 긴 시간을 필요로 하는 단점이 있어, 펄스 플라즈마나 토카막과 같이 빠르게 변하는 플라즈마를 측정하기에는 무리가 있다. 최근에 개발된 푸리에 컷오프 탐침(Fourier Cutoff Probe, FCP)는 기존의 컷오프 탐침의 느린 시간분해능을 개선하기 위해 개발되었다. [1] 펄스 형태의 단일신호를 플라즈마를 투과하기 전후로 비교하면 투과 스펙트럼 및 플라즈마 변수들을 얻을 수 있으며, 기존 연구에서 구한 시간 분해능은 약 15 나노초였다. 이 값은 펄스 발생장치의 스펙에 따라 변하게 된다. 펄스폭이 짧을수록 시간분해능이 좋아지지만, 무한정 좋아질 수는 없다. 이 논문에서는 FCP 측정의 시간 분해능을 이론적으로 구하고, 시간 분해능의 이론적 한계를 구했다.