• 방사선산업학회지
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• 제6권3호
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• pp.239-244
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• 2012

This study was conducted to investigate bacterial growth, viscosity, color, and sensory properties of gamma-irradiated Tarakjuk powder, a Korean milk porridge powder, at 1, 3, 5, 7, and 10 kGy. The total aerobic bacteria in non-irradiated Tarakjuk powder was $2.56{\log}\;CFU{\cdot}g^{-1}$, whereas it was not observed within the detection limit of $2{\log}\;CFU{\cdot}g^{-1}$ in samples irradiated at more than 1 kGy. Spore-forming bacteria, however, were not observed in all samples within the detection limit of $1{\log}\;CFU{\cdot}g^{-1}$. The viscosity of rehydrated Tarakjuk after gamma irradiation significantly decreased from 16,770 cP to 4,060 cP when irradiated at 10 kGy. The redness ($a^*$ value) and yellowness ($b^*$ value) evaluated using a colorimeter were significantly increased according to the increase in irradiation dose (p<0.05), while there was no difference in color evaluation conducted by panels. The overall acceptance decreased as the irradiation dose increased, and the 5 kGy sample was 4.0 (normal) on a 7-point scale. As a result, it is considered that a gamma irradiation of 5 kGy is enough to sterilize Tarakjuk powder with a acceptable sensory quality.

• 방사선산업학회지
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• 제5권2호
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• pp.119-124
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• 2011

Silver nano-particles (AgNPs) have attracted much attention for centuries due to their unique optical properties, electrical conductivities, oxidative catalysis, and antibacterial effect. In this study, AgNPs have been prepared by using aqueous $AgNO_3$ solution in the poly(vinyl alcohol) (PVA)/poly(ethylene glycol) (PEG) hydrogels. PVA and PEG powders were dissolved in deionized water, and then irradiated by a gamma-ray with a radiation dose of 50 kGy to make hydrogels. PVA/PEG hydrogels were dipped into $1.0{\times}10^{-2}M$ $AgNO_3$ solution for 1 hour. After that, the swollen hydrogels were irradiated by gamma-ray for the formation of AgNPs. FE-SEM is used to observe the formation of AgNPs as a function of the content of PEG and the irradiation dose. Also, AgNPs in the PVA/PEG hydrogels were monitored by UV-Vis. It is observed that the content of PEG and gamma-ray irradiation in the hydrogel is crucial to the formation of AgNPs. Finally, antibacterial tests indiacted that the hydrogel containing silver nanoparticle has antibacterial activity.

• 방사선산업학회지
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• 제4권1호
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• pp.53-57
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• 2010

Cooking drips which were obtained as by-product after seafood processing in the food industries, still contain lots of proteins, carbohydrates, and other functional materials. But, the seafood cooking drips are easily contaminated because of its rich nutrients, and their color are very dark. This study was conducted to investigate the effect of gamma irradiation on the quality of seafood cooking drips including Hizikia fusiformis, Enteroctopus dofleini, and Thunnus thynnus. The Hunter's color values (L, Brightness) of H. fusiformis, and T. thynnus were increased with increasing irradiation doses, showing becoming bright. The crude protein content and crude lipid content were increased by gamma irradiation. These results indicated that gamma irradiation increased extraction efficiency of available compounds in cooking drips.

• 방사선산업학회지
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• 제5권2호
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• pp.125-130
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• 2011

The purpose of this study was to evaluate the protective effect of the Perilla frutescens cv. Chookyoupjaso mutant water extract (PFWE) on gamma ray-induced oxidative stress in mice. Gamma-ray is one of the sources for inducing oxidative stress. The study was divided into 6 groups with 6 mice for each treatment. Groups I and II were treated with saline (vehicle) only, groups III, IV, V, and VI were pretreated with PFWE 10, 20, 50, $50mg\;kg^{-1}$ respectively for 2 weeks before gamma radiation. And then groups II, III, IV, V were irradiated. We found that the activities of aspartate transaminase (AST) and alanine transaminase (ALT) were increased and the activities of antioxidant enzymes such as superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), and glutathione reductase (GR) were decreased by irradiation in mice. However, treatment of PFWE attenuated the activities of AST and ALT in a dose-dependent manner in irradiated mice. Furthermore, treatment of PFWE significantly increased the activities of SOD, GPx, and GR in a dose-dependent manner in irradiated mice, except for the CAT. Interestingly, the activities of GPx and GR were significantly increased by PFWE treatment. Taken together, PFWE could be effective in protecting on gamma ray-induced oxidative stress in mice.

• 방사선산업학회지
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• 제6권1호
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• pp.11-15
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• 2012

This study confirmed the cytotoxicity and anti-inflammatory activities of natural herbal extracts (HE) including Eucommia ulimoides and Ulmus davidiana against human mast cell (HMC-1). HE was extracted with distilled water (at $75^{\circ}C$) and then freeze-dried for 5 days. Finally, the HE was sterilized by gamma radiation with $^{60}Co$ ${\gamma}$ source at room temperature. Cytotoxicity of the HE against HMC-1 cell was measured using cell counting kit-8 (CCK-8) assay. In addition, inflammatory cytokines such as $TNF-{\alpha}$, IL-6 and IL-8 were evaluated by ELISA kit on the HMC-1 cells with calcimycin A23187 and phorbol 12-myristate 13-acetate (PMA). The results showed that HE had no toxicity and reduced $TNF-{\alpha}$, IL-6, IL-8 response on HMC-1 cells.

• 원자력산업
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• 제7권9호통권55호
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• pp.36-37
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• 1987

일본에너지경제연구소는 ${\ulcorner}$일본에서의 원자력발전의 선택${\lrcorner}$이라는 제목의 보고서를 발표하였다. 다음에 이 보고서 중에서 각국의 플루토늄$\cdot$리사이클계획을 발췌$\cdot$소개한다.

• 전기저널
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• 10호통권106호
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• pp.40-46
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• 1985

전기중앙연구소는 물위에 원자력발전소를 띄우는 해상입지의 연구를 금년도부터 본격적으로 착수했다. 이 방식은 거대한 버어지 위에 원자로건물 발전소 본관등의 설비를 건설하는 것으로서 지진의 영향이 적으며 플랜트의 설계상 매우 유리하게 된다. 이 때문에 원자력 발전소의 입지가 확대될 뿐 아니라 플랜트의 표준화에 의해 건설코스트의 삭감, 건설기간의 단축등이 도모된다. 동연구소에서는 연구의 제1스텝으로서 2개년계획으로 피지비리티이 스타디이를 실시하여 부양식 원자력발전소의 기술적$\cdot$경제적인 실현가능성을 평가할 예정이다. 동연구소의 연구내용과 현재 진행되고 있는 다른 6개부문 연구내용을 소개하면 다음과 같다.

• 터널과지하공간
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• 제12권1호
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• pp.43-51
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• 2002

한국원자력연구소에서는 80년대 말부터 1996년까지 저준위 방사성 영구처분 연구사업을 수행한 바 있으며 2000년부터는 국가원자력중장기연구개발사업의 일환으로 한국원자력연구소와 한국수력원자력주식회사가 동굴 처분 관련 안전성 평가 연구를 공동 수행하고 있다. 본 기술 보고에서는 그 동안 개발된 연구 개발 성과들을 중심으로 중저준위 방사성폐기물 처분장 장기 안전성 평가에서 고려되어야 할 요소들과 현재까지 정립된 안전성 평가 방안들에 관하여 정리하였다.

• 원자력산업
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• 제7권10호통권56호
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• pp.79-81
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• 1987

일본의 전력중앙연구소는 최근 휴먼팩터연구센터의 연구개요를 정리발표 하였다. 동센터는 동 연구소내에 7월 1일부로 설치된 것으로써 민간인 총력을 집결하여 휴먼팩터(인간요인)에 기인하는 원자력발전소 사고의 방지책을 체계적으로 연구하는 곳이다. 5개년 계획으로 약10억엔의 연구개발자금을 투입, 그 성과는 일본 전력회사의 휴먼에러방지책에 직접, 반영시켜진다. 소원은 현재 14명이지만, 전력회사에서의 파견으로 확충하고, 피크시에는 20명으로 하고 있다. 동 센터의 연구개요는 다음과 같다.

• 과학과기술
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• 제32권3호통권358호
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• pp.30-31
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• 1999

우리나라는 세계에서 유일하게 경수로와 중수로를 모두 보유하고 있는 국가로 현재 14기의 원전의 기당되고 있다. 지난 85년 핵연료 국산화개발에 성공한 바 있는 원자력연구소 중수로용 개량핵연료개발팀은 최근 월성 원자력발전소와 같은 중수로에 쓰이는 개량핵연료를 개발해 이 분야에서 세계 최고 수준의 기술을 확보하게 되었다. 개발팀의 책임자인 석호천박사는 "우리의 기술력이 세계 최고 수준의 캐나다와 어깨를 나란히 할 수 있게 된 것은 20여명의 팀원들이 뭉쳐 10~20년을 끈질기게 연구해온 결과"라곰 말했다.