• 방사선산업학회지
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• 제8권1호
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• pp.7-10
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• 2014

This study was designed to evaluate the protective effect of silkworm hemolymph against ${\gamma}-irradiation$ induced damage in the liver of mice. Female Balb/C mice (6 weeks old) were exposed to ${\gamma}-irradiation$ (6 Gy) and administered orally to silkworm hemolymph ($5ml\;kg^{-1}$ BW) for 7 days post-irradiation. The body weight, spleen index, plasma aspartate transaminase (AST), plasma alanine transaminase (ALT), and liver malondialdehyde (MDA) levels were determined. Compared with irradiated control mice, the activity of plasma AST and the level of MDA were significantly decreased in mice treated silkworm hemolymph. These results show that silkworm hemolymph is found to have a protective effect against ${\gamma}-irradiation$ induced damage in mice.

• 원자력산업
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• 제8권12호통권70호
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• pp.11-15
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• 1988

영국 우라늄연구소가 지난 9월 런던에서 개최한 심포지움에서는 원자력산업계의 국제적인 공동사업 추진에 대한 유용성이 강조되었다. 다음은 Wendy Peters씨가 이 심포지움에서 발표된 논문을 요약하여 Atom지 11월호에 게재한 내용이다.

• Nuclear Engineering and Technology
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• 제26권2호
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• pp.190-196
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• 1994

AUC 공정으로 변환된 $UO_2$ 분말의 ball-milling 효과를 관찰하기 위하여 ball-milling 시간에 따른 소결성을 연구하였다. Ball-milling된 분말은 구형화 형태를 보이며, 그의 입자 크기 분포는 bimodal 양상을 나타냈다. 분말크기 분포가 bimodal인 경우, 그의 packing ratio가 monomodal gaussian 분포에 비해 높다. Ball-milling된 분말의 소결밀도 증가는 packing ratio에 의한 영향이 컸으며, ball-milling 시간이 길어질수록 packing ratio는 증가 하였다. AUC 공정으로 변환된 $UO_2$ 분말은 ball-milling을 함으로써, 그의 소결성이 향상됨을 확인하였다.

• 원자력산업
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• 제37권4호
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• pp.72-83
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• 2017

'미래 세대를 위한 우리의 에너지 선택'을 주제로 한 국내외 원자력 에너지 전문가 좌딤회가 4월 5일 경주 힐튼호텔 오크룸에서 열렸다. 원자력산업회의와 원자력문화재단이 공동 주최한 이번 좌담회는 4월 5~6일 열린 '2017 한국원자력연차대회'에 참석한 해외 원자력 전문가를 초청하여 마련된 것으로, 강재열 한국원자력산업회의 상근부회장(좌장), 김호성 한국원자력문화재단 이사장, William D. Magwood IV OECD-NEA 사무총장, Gordon Mackerron 영국 Sussex 대학교 과학정책연구소(SPRU) 교수, Tomoko Murakami 일본에너지경제연구소(IEEJ) 연구책임자, Michael Shellenberger 미국 Environmental Progress 회장 등이 참석하여 2시간에 걸쳐 의견을 나누었다. 좌담회 전문을 게재한다.

• 원자력산업
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• 제8권10호통권68호
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• pp.68-71
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• 1988

일본의 경수로기술이 나날이 발전하고 있는 가운데 초전도연구의 진전에 의핸 전력저장 등 전력기술도 새로운 전개를 보이고 있다. 이러한 신기술은 앞으로 원자력개발규모에 어떤 영향을 줄 것인가? 다음은 일본에너지경제연구소가 일본원자력위원회의 위탁을 받아 종합작성한 보고서에서 기술진보가 원자력발전규모에 주는 영향에 대해서 분석한 결과의 개요를 소개한 것이다.

• 방사선산업학회지
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• 제6권2호
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• pp.111-117
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• 2012

This study was conducted to improve organoleptic quality of gamma-irradiated Tarakjuk at 10 kGy with cheeses (Camembert, Cheddar, Gouda, and Edam) and flavors (Nurungji, cream, and vanilla-cream). Overall acceptability of gamma-irradiated Tarakjuk added each camembert cheese and vanilla-cream flavor was the highest among the all samples. In the effect of sterilization method on the quality of Tarakjuk, the autoclaved samples added with Edam cheese, Gouda cheese, and vanilla-cream flavor, respectively, were showed higher score on the overall acceptability than the irradiated samples, meanwhile the irradiated samples were superior in the other samples. In case of added mixture of Edam cheese and vanilla-cream flavor, irradiated Tarakjuk with mixture was showed the most of high score on overall acceptability. In conclusion, addition of mixture of cheese and flavor to Tarakjuk may help to improve organoleptic quality of sterilized Tarakjuk by gammairradiation.

• 방사선산업학회지
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• 제6권2호
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• pp.177-180
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• 2012

The acid and bile tolerance changes of 5 different lactic acid bacteria (LAB; Lactobacillus paracasei, Lactobacillus casei, Lactobacillus acidophilus, Lactobacillus plantarum, and Lactobacillus debruekii) with gamma irradiation were evaluated. The abilities of LAB to survive in the acidic conditions at the stomach and the bile acidic conditions at the beginning of the small intestine are the key functions for applying LAB to probiotics. In the results, all of LAB survived more than 50% after incubation in PBS (pH 2.5) for 2 hr, which indicated more than half of LAB are possible to pass through the stomach. However, gamma irradiation decreased the acid tolerances of LAB. The bile tolerances of all bacteria except Lactobacillus acidophilus were observed to survive at a 3% oxgall concentration in MRS, and 1 kGy of gamma irradiation to LAB did not affect any bile tolerances changes. But gamma irradiated Lactobacillus casei and Lactobacillus casei (3 kGy) showed decreasing survival rate with oxgall added MAS agar. In conclusion, gamma irradiation should be applied to yogurt or fermented foods with care because LAB could be changes their properties on acid and bile tolerances.

• 방사선산업학회지
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• 제6권1호
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• pp.23-29
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• 2012

In this study, we investigated the genetic variation in the general of monocot model plant (rice) in response to various ionizing irradiations including gamma-ray, ion beam and cosmic-ray. The non-irradiated and three irradiated (200 Gy of gamma-ray and 40 Gy of ion beam and cosmic-ray) plants were analyzed by AFLP technique using capillary electrophoresis with ABI3130xl genetic analyzer. The 29 primer combinations tested produced polymorphism results showing a total of 2,238 bands with fragments sizes ranged from 30 bp to 600 bp. The number of polymorphism generated by each primer combinations was varied significantly, ranging from 2 (M-CAC/E-ACG) to 158 (M-CAT/E-AGG) with an average of 77 bands. Polymorphic peaks were detected as 1,269 with an average of 44 per primer combinations. By UPGMA (Unweighted Pair Group Method using Arithmetic clustering) analysis method, the clusters were divided into non-irradiated sample and three irradiated samples at a similarity coefficient of 0.41 and three irradiation samples was subdivided into cosmic-ray and two irradiation samples (200 Gy of gamma-ray and 40 Gy of ion beam) at similarity coefficient of 0.48. Similarity coefficient values ranged from 0.41 to 0.55.

• 방사선산업학회지
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• 제9권1호
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• pp.9-13
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• 2015

Epoxy resin is widely used as aerospace, automobile, construction and electronics due to their good mechanical and electrical properties and environmental advantages. However, the inherent flammability of epoxy resin has limited its application in some field where good flame retardancy is required. Nano clay can enhance the properties of polymers such as flames retardancy and thermal stability. In this study, we have investigated the nanoclay filled epoxy composite, which has good flame retardancy while maintaining high mechanical properties. The cured epoxy resins were obtained using an electron beam curing process. The nano clays were dispersed in epoxy acrylate solution and mechanically stirred. The prepared mixtures were irradiated using an electron beam accelerator. The composites were characterized by gel content and thermal/mechanical properties. Moreover, the flammability of the composite was evaluated by limited oxygen index (LOI). The flame retardancy of nano clay filled epoxy composite was evidently improved.

• 방사선산업학회지
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• 제7권1호
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• pp.45-49
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• 2013

In tissue engineering application, a fibrous structure of scaffolds has been issued as an alternative system to regulate cell survival and tissue regeneration, and electrospinning technique has been popularly used to generate fibrous meshes or sheets mimicking the structure of native extracellular matrix (ECM). However, recent strategy in the scaffold development is expanded to provide the structural property as well as a biological property of native ECM, a variety of surface modification techniques have been used to introduce biological property. In this study, we developed biomimetic poly(L-lactide-co-${\varepsilon}$-caprolactone) (PLCL) nano- and micro-fibrous scaffolds as a unique platform with structural and biological properties with native ECM using electrospinning method and gamma-ray irradiation. Surface morphology of the scaffolds was observed by scanning electron microscopy, and alteration of surface property was evaluated with toluidine blue O staining, water contact angle measurement and ATR-FTIR analysis.