• 한국식품영양과학회지
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• 제36권4호
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• pp.453-457
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• 2007

감마선 조사가 비트의 품질특성 및 비트의 주요 색소인 betalain에 미치는 영향을 알아보기 위해 비트에 2.5kGy, 5kGy, 10kGy 및 30kGy로 감마선 조사를 실시하였다. 조사에 따른 betalain추출량에는 차이가 없었으며 betacyanin과 betaxanthin은 5kGy의 조사선량에서 높은 optical density 값을 나타내었다. 조사선량이 증가할수록 비트의 명도, 적색도 그리고 황색도는 감소하였으며 pH는 조사에 따른 차이를 나타내지 않았다. 10kGy이상의 감마선 조사는 물성에 나쁜 품질을 나타내었으며 항산화효과는 감마신 조사에 의한 유의적인 변화(p<0.05)를 보이지 않았다. 따가서 천연색소 및 물성 측면에서 볼 때 비트에 대한 10kGy 이상의 감마선 조사는 바람직하지 않은 것으로 생각한다.

• 한국식품과학회지
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• 제28권3호
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• pp.558-565
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• 1996

감마선 조사된 대투의 이화학적 품질 특성에서 일반성분 지방산 조성 및 무기질 성분은 모든 조사선량에서 변화가 없었으며, 질소 용해도파 추출성 phents 및 phytate 함량은 5 kGy까지의 조사군 사이에는 차이가 없었으나. 10 kGy와 20 k0y의 고선량 조사군에서는 다소의 영향이 화인되었으며, 1년 저장후에는 모든 시험군에서 감소현상을 보였다. 산가 및 유기산 함량도 2.5 kGy 조사군까지는 비조사군과 차이가 없었으나 5kGy 이상 조사군에서는 증가하는 경향이었고, 1년 저장 후 모든 시험군에서 증가함을 보였다. 조사된 대두의 총 아미노산 함량과 조성은 10 kGy 선량까지는 변화가 없었으나, 10kGy 이상의 조사군에서 cysteine과 methionine의 감소를 나타내었다. 대두 색도는 감마선 조사선량의 증가와 저장기간의 경과로 명도와 황색도의 감소가 적색도의 증가를 나타내었다.

• 한국식품과학회지
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• 제28권3호
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• pp.514-520
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• 1996

감마선 조사기법을 사용하여 새로운 건식공정의 공업용 변성전분 생산 기술개발을 위한 기초연구로서, 시판 옥수수 전분에 직접 감마선을 조사하여 감마선 조사 전분(0-110 kGy)의 이화학적 성질을 검토하였다. 감마선 조사선량이 증가함에 따라 blue value가 직선적으로 감소하였으며, alkali number와 용해도는 크게 증가하였다. $65-95^{\circ}C.$의 온도범위에서 전분용액의 광투과도 또한 감마선 조사선량이 증가함에 따라 현저히 증가하였으며, 물결합능력과 팽윤력은 각각 30 kGy 및 10kGy에서 최대값을 나타내다가 다시 감소하는 경향을 나타내었다. 비조사 전분에 비해 감사선 조사 전분의 호화점도는 현저한 감소 현상을 나타내었다. peak 점도의 경우 7,000 B.U.(비조사 전분)에서 60 B.U.(110kGy)로 그 값이 100배 이상 현저히 감소하였으며 $30^{\circ}C$의 냉각점도도 약 300배 이상 급격한 감소를 나타내었다. 현재 시판중인 산처리 전분은 30kGy의 감마선조사 전분과 유사한 특성을 나타내었으며, 산화전분은 100kGy의 감마선 조사전분과 유사한 성질을 나타내었다.

• 한국식품저장유통학회지
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• 제6권4호
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• pp.411-416
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• 1999

닭고기에 감마선 3, 7 kGy를 조사한 후 저장 기간 및 온도에 따라 육색변화, 단백질 분해, TBA가, 산가, 휘발성 염기태 질소 등을 측정였다. 육색변화에서 조사직후 조사선량에 관계없이 저장기간의 경과에 따라 metmyoglobin은 함량이 다소 증가되는 경향이었고 냉동저장에서는 조사에 따른 영향없이 저장기간에따라 점차 감소하는 경향이었다. 전기영동 결과는 감마선조사군과 비조사군 사이의 변화는 거의 없었으며, 저장기간에따라 약 105 kDa의 단백질 subunit 가 분해되기 시작하여 8주후에는 완전소실 되었고, 특히 약 32 kDa에서 40 kDa의 분자량을 가진 단백질 subunit의 경우 모든 시험군에서 저장기간에 따라 서서히 분해되면서 소실되거나 두개의 분획으로 분리 되어 새로운 band를 형성하였다. 한편, TBA가의 경우 냉장, 냉동 저장시료 모두 저장기간 및 감마선 조사 선량의 증가에 따라 크게 증가하였고 산가는 조사선량의 증가에 따라서는 오히려 감소하였다. VBN함량 변화의 경우에는 냉장 저장 8주후의 비조사 시료는 7 kDy조사 시료에 비해 약 4배의 증가를 나타내었다.

• 전기의세계
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• 제18권2호
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• pp.15-20
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• 1969

The main focus of this paper is on the study of the .gamma. ray irradiation effect upon the electrical properties of a B-kind insulator which is one of the inorganic insulators. The mica is so typical of the B kind insulators as to be selected for a sample. DC, AC, and Impulse voltage is applied to the variable .gamma. ray irradiated dose samples with the constant time duration and the time variable samples with the .gamma. ray irradiated dose. The dielectric breakdown voltage and dielectric constant are measured from the samples and we get the experimental data that the dielectric breakown voltage variations are relatively large, but the dielectric constants are almost constant. The above conclusion is useful for the selection and application of the inorganic insulators under the irradiation effects, and we expect that the conclusion can apply to not only B-kind insulators but also the inorganic insulators.

• 방사선산업학회지
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• 제6권4호
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• pp.311-316
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• 2012

The purpose of this study was to compare the sensory effects of different culinary methods such as electric pan cooking and charcoal roasting on gamma irradiated ready-to-eat chicken at 10 kGy. Evlauation of sensory properties were measured by estimating the organoleptic characteristics and physicochemical properties (TBARS, hardness and color different matters). The results showed that gamma irradiation after charcoal-roasting could more effectively moderate the decrease of sensory qualities and reduce off-flavor of ready-to-eat chicken than gamma irradiation after following electric pan cooking. These results suggest that gamma irradiation after charcoal broiling can be an effective culinary method for the preparation of ready-to-eat chicken.

• 방사선산업학회지
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• 제8권1호
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• pp.1-5
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• 2014

This study investigated the reduction of microbial population and sensory properties in red pepper powders irradiated by gamma ray, electron beam, and X-ray. Populations of total aerobic bacteria and yeast & molds in red pepper powders were decreased by irradiation treatment in a dose-dependent manner. Gamma ray, electron beam, and X-ray at doses above 8 kGy caused 100% inhibition on growth of aerobic bacteria in red pepper powders. Inhibitory activity of X-ray on sterilization of red pepper powders was significantly equal to or higher compared to gamma ray and electron beam. Color and off flavor in red pepper powders were no significant difference among the control and samples irradiated with gamma ray, electron beam, and X-ray. As a result, the gamma ray, electron beam, and X-ray irradiation can be used to sterilize the microbial growth in red pepper powders without quality loss.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1991년도 추계학술대회 논문집 학회본부
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• pp.435-438
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• 1991

This work is aimed to clarify the effect of only crosslinking of polyethylene on the water tree propagation and thus the crosslinking of LDPE was made by use of $Co^{60}$ $\gamma$-ray irradiation at room temperature. For this purpose, before water tree testing under same test conditions, injection molded samples were made of LDPE using CNRS laboratory model and also some of them were irradiated under different dose rate for crosslinking. Afterwards, the aged specimens were put into microscopic investigation as a mean to compare their different morphological aspects by use of SEM for the fractured surface. The SEM observation points out that the untreed region in the irradiated PE shows the densed structure whereas that in the LDPE is not closely packed. Also in the water treed region of LDPE, the density and the dimension of voids are higher than those in irradiated PE. Based on our results, it seems that the difference in the PE structure could sufficiently contribute to cause the different water tree propagation of these materials.

• 대한수의학회지
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• 제43권3호
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• pp.323-331
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• 2003

We performed this study to determine the late biological effect of gamma radiation and effect of Bu-Zhong-Yi-Qi-Tang (BZYQT), a prescription of traditional Oriental medicine, on radiation-induced late biological effect (survival, hematological change, carcinogenesis) of mice irradiated with 3 Gy of gamma-radiation. There were little difference in body weights between normal and irradiated mice. Survival rate were decreased in irradiated mice and the survival rate and mean survival time of the groups treated with BZYQT were far better than the irradiation control group. A significant elevation of total leukocyte or lymphocyte counts was seen at week 4 and 12 of the group treated with BZYQT. Stimulated recovery by the extract from BZYQT was also observed in thrombocyte. Main gross findings of irradiated mice were appeared as enlargement of spleen, thymus and liver, tumorous nodules of lung and cyst or mass of ovary. Microscopically, there were various findings including hematopoietic and lymphoid tumor, lung cancer, ovarian cancer and cancer of other lesions. BZYQT reduced the incidence of tumor development. Further studies are needed to characterize better the protective nature of ingredients and active compounds.

• 한국임상수의학회지
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• 제7권2호
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• pp.451-469
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• 1990

The present study was carried out to investigate whether the aloe had a radioprotective effect in mice exposed to cobalt-60 gamma radiation or not. The survival ratio of mice for 30 days, hematopoiesis of blood-forming stem cells by spleen colony assay, chromosomal aberration frequency of bone marrow cells and histopathological findings of bone marrow were investigated. The survival ratios of aloe administered groups with concentration of 250, 500, 1,000 and 1,500mg for 3 days before irradiation and control group in cobalt-60 gamma irradiated mice(700rads whole body irradiation, dose rate of 50rads/min.) were 77.4, 79.3, 80.6, 90.0 and 53.1％, respectively. The survival ratios of pre-irradiation aloe administered groups were superior to those of post-irradiation aloe groups and control group. In spleen colony assay, Aloe vera administration before irradiation enhanced the recoveries of numbers of blood-forming stem cells of bone marrow of irradiated mice. There were decreased chromosomal aberrations of bone marrow cells at the first day after irradiation in aloe administered groups compared to that of control group. Histopathological findings in the bone marrow of irradiated mice were hypocellularity due to the depletion of myelocytes, abundant of fat vacuoles and these changes were weakened in aloe administered groups compared to that of control group.