• Nuclear industry
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• v.17 no.1 s.167
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• pp.82-88
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• 1997

한국원자력연구소와 삼양제넥스연구소는 최근 제지$\cdot$섬유 및 식품 공업 등에 널리 사용되고 있는 공업용 전분을 방사선을 이용하여 새롭게 생산하는 방법을 세계최초로 개발하였다. 본 기술의 내용은 전분에 산화 보조제 첨가와 방사선 조사를 병행하여 점도 안정성이 우수하고 경제성이 높은 고점도에서 중점도 및 저점도까지의 필요에 따라 요구되는 변성 전분을 건식으로 제조하는 기술로서, 변성 전분의 생산성 향상 및 생산비 절감 효과와 함께 환경 공해 없이 변성 전분을 생산할 수 있어 국내 전분 공업에서 크게 이용될 것으로 전망된다. 또한 방사선 조사로 오염 유기체에 의한 손실을 방지하여 $10\~20\%$ 정도의 간접 증산 효과와 전분 추출 시간 단축에 따라 가공 에너지 절감, 그리고 환경 규제 물질인 아황산 용액의 농도를 감소시켜 작업자의 건강 보호와 환경 보전에도 크게 이바지할 수 있으며, 전분 추출률 증대에 따른 수입 절감 효과도 크게 기대된다.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.3-6
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• 2007

현재 우리나라는 원자력 발전에 대한 의존도가 매우 높고 그 기술 또한 우수하다. 그러나 중성자 스펙트럼을 사용하여 폭발물 탐지를 위한 시스템 개발 기술은 미흡한 실정이다. 본 논문은 신경망(Neural Networks)을 한국 원자력 연구소 중성자 스펙트럼 패턴을 분류하는 시스템에 적용하였다. 데이터 획득방법을 달리하여 두 개의 신경망을 구현하였고 그 결과를 분석하여 보았다. 먼저 폭발물에 다량 포함되어 있는 C(Carbon), N(Nitrogen), O(Oxygen) 3개의 물질을 중심으로 중성자 스펙트럼을 분석하였다. 다른 하나는 중성자 스펙트럼을 전체 영역으로 획득한 데이터를 바탕으로 신경망을 구현하여 인식률을 확인하였다. 실험결과 전자의 경우 62.5%의 인식률을, 후자의 경우 신경망은 83.48%의 인식률을 나타내었다.

• Journal of Radiation Industry
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• v.4 no.4
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• pp.297-306
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• 2010

Due to the increasing incidence of diabetes, obesity and hypertensive, stevia has been placed great attentions as the sweetener to substitute sucrose in the world. Stevia was introduced to Korea in 1970's, but it has not been an attractive crop in that time. However, recently it has more attention for the natural food sweet additives. Because stevia have many problems for cultivation especially cultivar, seed germination, fertility, uniformity and glycoside quality, the sport mutation was attempted to in vitro plants for the improvement of some characteristics. The young in vitro plants was nursed on MS medium supplemented with $1mg\;l^{-1}\;GA_3$. Shoots of 10 cm height were irradiated with 0~200 Gy of gamma ray and the every node was separated and inoculated on MS basic medium. The lethality, number and length of shoot, numbers of node and branch were investigated for the evaluation of radiosensitivity. The optimum dose of gamma ray seemed to be around 80 Gy for the sport mutation induction in stevia. The lower node was more sensitive than higher node to radiation.

• Korean Journal of Breeding Science
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• v.49 no.3
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• pp.150-156
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• 2017

This study was carried out to compare the survival and mutation rates and mutation spectrum by gamma-irradiation on rooted and unrooted cuttings of three spray type ('Lovelydia', 'Yellowbabe', and 'Haetsal') and two standard type ('Vital' and 'Aqua') cultivars in roses. Two groups, rooted and unrooted cuttings were gamma-irradiated at 70Gy for 24 hours. The irradiated rooted and unrooted cuttings were planted in a greenhouse, and survival, mutation rates and mutation spectrum were investigated 30 weeks after planting, respectively. As a result, survival and mutation rates of gamma-ray irradiated plants were 16.4%~50.8% and 0~5.1% for unrooted cuttings, and 39.4%~55.1% and 0.7%~7.4% for rooted cuttings, respectively. In conclusion, both survival and mutation rates were a little higher on rooted cuttings than on unrooted cuttings. However, when only survived plants after gamma-ray irradiation were considered, mutation rates were 0~10% and 1.8%~14.1% for unrooted cuttings and rooted cuttings, respectively, showing no significant difference. In addition, diverse variations on color and number of petals or shape of flowers were detected both in plants from rooted and unrooted cuttings, which indicated that there was no significant difference in mutation spectrum between two groups.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2009.11a
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• pp.121-122
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• 2009

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2006.11a
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• pp.137-138
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• 2006

• Journal of Radiation Industry
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• v.4 no.3
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• pp.221-226
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• 2010

Physical detection methods, photostimulated luminescence (PSL), thermoluminescence (TL) and electron spin resonance (ESR) were applied to detect electron beam-irradiated agricultural products, such as red pepper, black pepper, raisin, walnut, beef seasoning and pistachio. The absorbed irradiation doses for representative samples were controled at 0, 1, 3, 5 and 10 kGy. PSL values for non-irradiated samples were <700 counts/60s (lower threshold, $T_1$) except beef seasoning, whereas those of irradiated samples were more than 5,000 photon counts, upper threshold ($T_2$) in black pepper, raisin, and beef seasoning and intermediates values of $T_1-T_2$ in red pepper, walnut, and pistachio. Minerals seperated from the samples for TL measurement showed that non-irradiated samples except pistachio (TL ratio, 0.12) were characterized by no glow curves situated at temperature range of $50{\sim}400^{\circ}C$ with TL ratio (0.01~0.08), while irradiated samples except pistachio at only 1 kGy (TL ratio, 0.08) indicated glow curve at about $150{\sim}250^{\circ}C$ with TL ratio (0.28~3.10). ESR measurements of irradiated samples showed any specific signals to irradiation. The samples of both red pepper and pistachio were produced specific signals derived from cellulose radicals as well as single line signals for black pepper and walnut, and multiple signals derived from crystalline sugar radicals for raisin and beef seasoning. In conclusion, The ESR methods can apply for detection of pistachio exposed to electron beam but PSL and TL are not suitable methods. Furthermore, TL and ESR suggeted that both techniques were more useful detection method than PSL to confirm whether red pepper, walnut and beef seasoning samples have been exposed to electron beam.

• Journal of Radiation Industry
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• v.10 no.4
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• pp.189-192
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• 2016

$^{68}Ga$ has emerged as a promising candidate for non-invasive diagnostic imaging within Positron Emission Tomography (PET) because of its advantageous radiochemical characteristics ($t_{1/2}=68min$, ${\beta}^+$ yield ~89%). $^{68}Ga$ forms a stable chelation with various ligands and it is possible to be quickly and easily study using a $^{68}Ge/^{68}Ga$ generator. Commercial $^{68}Ge/^{68}Ga$ generators are chromatographic system using the inorganic materials such as alumina and tin dioxide which are employed as column matrixes for $^{68}Ge$. In this study, we tried out to make $^{68}Ge/^{68}Ga$ generator system with the $^{68}GeO_2$ microstructures for column matrix. $^{68}Ge$ tends to have stable bond with oxide as $^{68}GeO_2$ microstructures. The $^{68}GeO_2$ has been synthesized by hydrolysis of $GeCl_4$ (sol-gel method) and characterized by X-ray diffraction and scanning electron microscope for geometrical analysis. The stability of $GeO_2$ was tested using eluents with diverse solvents(water, ethanol and 0.1 N HCl). The radioactivity of $^{68}Ga^{3+}$ in eluate through $GeO_2$ was measured to prove a function as column material for a generator.

• Korean Journal of Breeding Science
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• v.40 no.3
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• pp.303-307
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• 2008

We bred a new green-kerneled glutinous rice variety that can be cultivated in the whole area of Korea, because only one native green-kerneled glutinous rice cultivar, "Saengdongchalbyeo", has been cultivated in the southern coastal area due to its late heading. The seeds of "Saengdongchalbyeo" were irradiated with 200 Gy of gamma ray in 1995. A promising mutant variety, "Nogwonchalbyeo" ("Wonnong 17") was selected through line selection and regional yield trials. In particular, the new variety revealed at the earlier mid of August compared to that of "Saengdongchalbyeo", the early of September, and it was considerably tolerant to a field lodging due to its shortened culm length. Also, "Nogwonchalbyeo" had a higher ripened grain ratio and 1,000 grain weight compared to the original variety. The brown grain yield of the new variety was about 5.40 MT/ha, which was 11.3% higher than that of the original variety, in the regional yield trials at 3 different fields during 2000~2001. The brown and milled grains of the new rice variety contained 20 to 65% higher amount of total amino acids, respectively than that of the original and two checks. For chlorophyll -a, -b and total chlorophyll, the new variety showed nearly two-fold higher than the checks, and for the carotenoid, it had 5.3 - 7.6 times higher amount. These results showed that the new variety can be cultivated as a special green-kerneled glutinous rice with high functional compounds.

• Proceedings of the KIEE Conference
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• 2004.05b
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• pp.162-165
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• 2004

한국원자력연구소의 원자력로봇랩의 연구목표는 인간의 접근이 제한된 고방사선 지역에서 주요 기기의 감시 점검 및 유지 보수 작업을 수행 할 수 있는 원자력용 다기능 내방사선 로봇을 개발하는 것이며 이를 달성하기 위해 원격 로봇시스템 및 로봇 핵심 기술에 대한 기초 연구 및 실용화 연구에 역점을 두고 있다. 본 논문에서는 한국원자력 연구소의 원자력로롯랩에서 그 동안 연구, 개발해온 원자력산업용 로봇의 개발 현황에 대하여 소개하고자 한다.