• Journal of Radiation Protection and Research
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• 제31권4호
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• pp.219-235
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• 2006

방사선이용에 대한 중요도에 비추어 볼 때 일반인 중 지식수준이 높은 대학생을 중심으로 한 방사선이용에 대한 태도 연구는 미미한 실정이므로 방사선이용에 대한 태도 특성을 파악하여 방사선이용에 대한 태도수준 향상을 위한 교육에 필요한 시사점을 도출하고자 대학생 517명을 대상으로 2005년 10월 10일부터 5일간에 걸쳐 설문조사를 실시하여 다음과 같은 결과를 도출하였다. 첫째, 방사선 관련 교육을 받은 경험이 있는 경우는 주전공과 월수입에 따라서 통계적으로 유의한 차이를 나타냈다. 둘째, '내가 살고 있는 곳에 종합병원이나 대학병원이 설치되는 것을 찬성한다.'가 $3.73{\pm}1.00$점으로 가장 높은 태도수준을 나타냈고 '내가 살고 있는 지역에 방사성폐기물 처리장이 설치되는 것을 찬성한다.'가 $2.63{\pm}1.09$점으로 가장 낮은 태도수준을 나타냈다. 셋째, '우리나라의 원자력 발전소 및 방사성폐기물 처리장의 설치찬성'의 태도 수준에 비해 '거주지의 원자력발전소 및 방사성폐기물 처리장의 설치 찬성'의 태도수준이 낮게 나타났다. 넷째, 태도수준이 가장 낮은 '거주지역에 방사성폐기물 처리장이 설치되는 것을 찬성한다'에 대해서 성별, 학년에 따라 유의한 차이를 나타냈다.

• Journal of Radiation Protection and Research
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• 제30권4호
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• pp.221-230
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• 2005

방사선 안전문화가 생활화 될 수 있도록 시대적 환경에 부합되는 방사선안전에 대한 전 국민적 인식 전환이 필요하다. 일반인 중 사회여론 형성에 적극적이고 지식수준이 높은 대학생을 중심으로 방사선이용에 대한 지식, 의식도 및 태도를 파악하여 방사선이용에 대한 올바른 정보제공을 위한 교육프로그램에 필요한 시사점을 도출하고자 하였다. 일부 대학생 528명을 대상으로 2005년 10월 10일부터 10월 15일까지 설문조사를 실시하였다. 방사선이용에 대한 교육을 받지 않은 경우 415명(80.7%), 교육을 받지 못한 이유로는 '교육 기회가 없어서' 265명(77.9%)으로 높은 빈도를 보였다. 방사선 이용에 대한 기초지식은 총 점 15점을 만점으로 전체 $5.96{\pm}2.90$점으로 낮게 나타났고 방사선이용에 대한 의식도는 평균 5점을 만점으로 전체 $3.65{\pm}0.50$점으로 나타났으며 방사선이용에 대한 태도는 평균 5점을 만점으로 전체 $3.23{\pm}0.46$점으로 나타났다.

• Nuclear Engineering and Technology
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• 제54권2호
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• pp.523-531
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• 2022

In order to study the sensitivity and the uncertainty of the Moroccan research reactor TRIGA Mark II, a model of this reactor has been developed in our ERSN laboratory for use with the N-Particle MCNP Monte Carlo transport codes (version 6). In this article, the sensitivities of the effective multiplication factor of this reactor are evaluated using the ENDF/B-VII.0, ENDF/B-VII.1 and JENDL-4.0 libraries and in 44 energy groups, for the cross sections of the fuel (U-235 and U-238) and the moderator (H-1 and O-16). However, the quantification of the uncertainty of the nuclear data is performed using the nuclear code NJOY99 for the generation and processing of covariance matrices. On the one hand, the highest uncertainty deviations, calculated using the ENDFB-VII.1 and JENDL4.0 evaluations, are 2275, 386 and 330 pcm respectively for the reactions U₂₃₅(n, f), $ U_{235}(n\bar{\nu})$ and H₁(n, γ). On the other hand, these differences are very small for the neutron reactions of O-16 and U-238. Regarding the neutron spectra, in CT-mid plane, they are very close for the three evaluations (ENDF/B-VII.0, ENDF/B-VII.1 and JENDL-4.0). These spectra present two peaks (thermal and fission) around the energies 0.05 eV and 1 MeV.

• Journal of Photoscience
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• 제9권3호
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• pp.37-40
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• 2002

Astronauts are constantly exposed to space radiation at a low-dose rate during long-tenn stays in space. Therefore, it is important to determine correctly the biological effects of space radiation on human health. Space radiations contain various kinds of different energy particles, especially high linear energy transfer (LET) particles. Therefore, we have to study the relative biological effectiveness (RBE) of space radiation under microgravity environment which may change RBE from a stress for cells. Furthermore, the research about space radiation might give us useful information about birth and evolution of life on the earth. We also can realize the importance of preventing the ozone layer from depletion by use of exposure equipment to sunlight at International Space Station (ISS).

• 통합자연과학논문집
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• 제13권1호
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• pp.27-33
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• 2020

The unsustainable human activities like increased use of automobiles, heavy industrialization and the use of large volumes of fertilizers, chemicals and pesticides in the agricultural land cause climate change problems in one way or another. Under normal circumstances, the heat radiations from the sun will be reflected back. An excessive volume of GHGs in the atmosphere would prevent these radiations from reflecting back. East Asia is facing severe climate change issues in recent times. A lot of climate change problems such as hurricanes and floods have been reported from this region in the last couple of decades. The study aimed at investigating the climate change in East Asia with changing Sea Surface Temperature (SST). The study adopted a quantitative research method with a case study research design where a deliberate focus was made on the East Asia Region. Secondary data was gathered and analyzed to yield both descriptive and inferential statistics. The study concluded that the impact of East Asia Climate variability was significant mainly for some extreme events. Also, the study concluded that there was a significant link between the change of the East Asia climate variability and that of the sea surface temperature. Further, the study concluded that a linear relationship existed between the sea surface temperature and the climate of East Asia. Hence, a linear regression was a significant predictor of the East Asia Climate (EAC) based on changing sea surface temperature. The model revealed that 37.4% of the variations in the climate change index were explained by the changes in the sea surface temperature. The climate was expected to change with a value of 49.48 for a unit change in the sea surface temperature.

• Journal of Radiation Protection and Research
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• 제26권3호
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• pp.149-154
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• 2001

Calculational models to evaluate radiation doses resulting from the medical use of high energy beta-ray sources are presented. The radioactive sources considered are Sr-90/Y-90 used as ophthalmic applicator, Re-188 used for treating restenosis of coronary artery, and Ho-166 used for treating hepatic tumors. Typical therapeutic situations which might induce relatively high radiation doses the medical person involved were considered to compute by using MCNP-4C Monte Carlo code the radiation doses. The calculation results suggest that for all of the cases considered, the evaluated radiation doses are negligible compared to the dose limits. It is also found that the effect of Bremsstrahlung radiations on the total dose is insignificant, and hence the conventional lead gown is also effective in shielding beta-rays.

• Journal of Radiation Protection and Research
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• 제20권1호
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• pp.37-44
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• 1995

과학기술처의 개인방사선피폭선량평가에 관한 기술기준이 제정된 이후 TLD에 의한 개인피폭선량평가 기술은 많은 발전이 있었으나, 우리나라 대부분의 방사선관련 산업체에서 방사선 피폭관리용으로 사용되고 있는 필름배지의 정확한 선량평가기술을 확보하기 위한 연구는 아직도 미진한 상태이다. 따라서 본 연구에서는 ISO 표준방사선장을 이용하여 i) 실험식에 의한 방법, ii) Degree-of-fit에 의한 방법, 그리고 ) Matrix에 의한 방법으로 필름배지에 의한 선량평가 알고리즘개발방법을 제시하였다. 이러한 방법들에 의한 계산값은 조사량과 ANSI N13.11에서 제시하고 있는 성능지수 이내에서 잘 일치하였으며, 이는 X, ${\gamma}$ 혹은 혼합방사선장에서 선량평가에 유용하게 혼용될 수 있을 것이다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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• pp.200.1-200.1
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• 2010

Solar energy is one of the most promising energy resources in the future. For the application and dissemination of solar energy technologies in various fields, reliable data sets of solar irradiation are needed for engineers, researchers, businessmen, and policy makers. Global horizontal solar radiation is needed for the use of flat plate collector, solar domestic hot water system, photovoltaic devices and passive systems like green house. In many countries, solar radiation data accumulated for more then 40 or 50 years and typical weather data are published with average of more then 30 years. In Korea, those global total radiations are measured for about 30 years. With the connections of computer network, measured data could be transmitted to the central control system at key station through Ethernet lines. The data acquisition systems are connected to be automatically controlled by the monitoring network. Global horizontal solar radiation data 16 locations were measured and averaged from 1982 to 2008.

• 비파괴검사학회지
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• 제9권1호
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• pp.106-110
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• 1989

Bolting degradation problems in primary coolant pressure boundary applications have become a major concern in the nuclear industry. In the bolts concerned, the failure mechanism was either corrosion wastage(loss of bolt diameter) or stress-corrosion cracking.(3) Here the manual ultrasonic testing of RPV(Reactor Pressure Vessel) and RCP(Reactor Coolant Pump) stud has been performed. But it is difficult to detect indications because examiner can not exactly control the rotation angle and can not distinguish the indication from signals of bolt. In many cases, the critical sizes of damage depth are very small(1-2 mm order). At critical size, the crack tends to propagatecompletly through the bolt under stress, Resulting in total fracture.(3) Automatic stud scanner for studs(bolts) was developed because the precise measurement of bolt diameter is required in this circumstance. By use of this scanner, the rotation angle of probe was exactly controlled and the exposure time of radiations was reduced.

• Nuclear Engineering and Technology
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• 제51권3호
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• pp.647-653
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• 2019

A comprehensive study of photon interaction features has been made for some alloys containing Pd and Ag content to evaluate its possible use as alternative gamma radiations shielding material. The mass attenuation coefficient (${\mu}/{\rho}$) of the present alloys was measured at various photon energies between 81 keV - 1333 keV utilizing HPGe detector. The measured ${\mu}/{\rho}$ values were compared to those of theoretical and computational (MCNPX code) results. The results exhibited that the ${\mu}/{\rho}$ values of the studied alloys are in same line with results of WinXCOM software and MCNPX code results at all energies. Moreover, Pd75/Ag25 alloy sample has the maximum radiation protection efficiency (about 53% at 81 keV) and lowest half value layer, which shows that Pd75/Ag25 has superior gamma radiation shielding performance among the compared other alloys.