• Journal of Radiation Protection and Research
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• 제46권3호
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• pp.143-150
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• 2021

Since its establishment in 2018, the Young Generation Network (YGN) has been dedicated, with support of the International Radiation Protection Association (IRPA), to a variety of activities to promote communication, collaboration and professional development of students and young professionals in the area of radiation protection and its allied fields. This article reports our recent activities from the middle of 2018 to the beginning of 2021, with highlights on some important events: "Joint JHPS-SRP-KARP Workshop of Young Generation Network" (December 2019 in Japan); contribution to "Nuclear Energy Agency Workshop on Optimization: Rethinking the Art of Reasonable" (January 2020 in Portugal); survey on the impact of coronavirus disease 2019 (COVID-19) on radiation protection among IRPA YGN members (March 2020); and contribution to IRPA15 (15^th International Congress of the IRPA; January-February 2021, online). The discussion and insight obtained from each activity are also summarized. The IRPA YGN will aim to achieve its on-going activities and continue to follow the ways paved in the Strategic Agenda and despite the challenges raised by the COVID-19 pandemic. Namely, running an international survey (for example, on the usage of social media in radiation protection, and on the long-term consequences of the COVID-19 pandemic), engaging national YGNs, extending the network, finding new relationships with networks with an interest in the young generation and participation in (remote) events will be aspired for.

• Journal of Radiation Protection and Research
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• 제39권3호
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• pp.142-149
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• 2014

한국은 국가건강검진을 시행하여 국민건강증진에 크게 기여하고 있으며 그 수검률 또한 증가하고 있다. 본 연구는 수검률 증가에 따른 방사선검사의 증가가 예상되어 그 이용 빈도(이용량)와 피폭선량을 파악하고자 한다. 본 연구는 2011년 국민건강보험공단 건강검진 분석 자료에서 방사선검사를 분리하여 이용량을 파악하고, UNSCEAR 2008년 보고서의 수록되어 있는 검사별 선량을 적용하여 국가건강검진에서 방사선검사로 인한 피폭선량을 추정한다. 주요 분석결과 2011년 국가건강검진 수검자 1인당 평균 피폭선량은 0.57 mSv로 추정되었고, 최대 11.081 mSv, 최소 0.02 mSv로 추정되었다. 방사선검사의 이용 빈도와 피폭선량은 각각 총 16,005,914건, 6,311.76 person-Sv로, 이중 이용량은 흉부 X선검사가 1,070,569 (69.17%)건으로 가장 높았고, 피폭선량은 위장조영검사가 5,217.94 (82.67%) person-Sv로 가장 높았다. 성 연령별 결과 39세 이하를 제외한 전 연령대에서 여성의 수검비율과 피폭선량이 높았고, 특히 50-54세 여성이 1,674,787 (10.5%)건, 701.59 (11.1%) person-Sv로 가장 높았다. 검사별 선량에서 위장조영검사가 전체 82.67%를 차지하는 만큼 의료상(목적) 반드시 시행하는 경우를 제외하고는 위장내시경검사를 선택하여 수검 받도록 정책적으로 장려하고 외국의 사례와 같이 경제성과 실효성 평가에 따라 폐지된다면 국가건강검진에의 방사선피폭은 현저히 줄어들 것으로 예상한다.

• Asian Pacific Journal of Cancer Prevention
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• 제15권6호
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• pp.2821-2823
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• 2014

Background: Esophageal and gastric cancer generally have a poor prognosis and may share common risk factors. It has been demonstrated that the pesticide usage may contribute to development of many cancer types. In this study, the relation between amount of pesticides used in agriculture and esophageal and gastric cancer incidence was researched. Materials and Methods: Findings from the data bank of the Ministry of Health Provincial Health Directorate Cancer Records Center between the years of 1998-2010 were used. All patients who were diagnosed with gastric and esophageal cancer histopathologically were included. Data for annual pesticide usage were obtained from Provincial Agriculture Directorate for the same time period. Statistical analysis was performed using the Spearman test. Results: One thousand eight hundred and ninety-six patients were involved in the study, 1,233 males (65%) and 663 females (35%), 230 with esophageal cancer (12.1%) and 1,666 with gastric cancer (87.9%). No statistically significant relation was apparent between pesticide amount used and esophageal cancer (p: 0.87). Conclusions: In our study, there was no relationship between pesticide usage and esophageal or gastric cancer. However, the time between pesticide usage and cancer development was not known, qualifying the comparison.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2010년 춘계학술대회논문집
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• pp.252-257
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• 2010

The availability of the thermal energy has been deeply recognized recently to encourage the cascade usage of thermal energy from combustion. Within the frame work, a 1 kW class Stirling engine based cogeneration system has been proposed for a unit of a distributed energy system. The capacity has been designed to be adequate for the domestic usage, which requires high compactness as well as low emission and noised. To develop a highly efficient system with satisfying these requirements, a premixed slot flame burner has been proposed and a series of numerical simulation has been performed to establish a design tool for the combustion chamber. The thermal radiation model has been found to highly affect the computational results and a proper resolution to analyze the heat transfer characteristics of the high temperature heat exchanger. Finally, the combustion characteristics of the premixed flame with the metal fiber type burner has been studied.

• 치위생과학회지
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• 제15권3호
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• pp.254-258
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• 2015

치과병의원에서 사용하고 있는 이동형 치과 X선 발생장치를 이용하여 두경부 마네킹에 X선을 조사할 때 주변의 공간선량을 측정하고, 동일한 방법으로 고정형 X선 발생장치에 적용하여 측정된 공간선량을 상호 비교하며, 더불어 기기 및 위치별 공간선량을 비교 분석한 결과는 다음과 같다. 이동형 X선 발생장치의 평균 공간선량은 $37.51{\mu}Sv$로 고정형 X선 발생장치의 $10.77{\mu}Sv$보다 매우 높았다(p<0.001). 이동형 X선 발생장치의 기기별 공간선량은 $17.77{\mu}Sv$부터 $68.90{\mu}Sv$까지 큰 차이를 나타냈다(p<0.05). 위치별로는 직전 위치가 $54.14{\mu}Sv$로 가장 높았고, 직우 위치가 $13.60{\mu}Sv$로 가장 낮았으며, 직좌와 직후 위치는 $42.12{\mu}Sv$, $40.18{\mu}Sv$로 유사하였다(p<0.01). 이상의 결과를 통해 이동용 치과 X선 발생장치는 이동 불가능한 환자만을 대상으로 제한적으로 시행하여야 하며, 반드시 환자와 술자 모두 납 방어복을 착용하여 방사선 피폭을 최소화해야 할 것이다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1989년도 한국자동제어학술회의논문집; Seoul, Korea; 27-28 Oct. 1989
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• pp.230-234
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• 1989

This paper presents the design of a prototype robot and architecture of a distributed control system. The robot, named as KAEROT, has been developed for the purpose of the reduction of personal radiation exposure and the remote maintenance tasks in nuclear facilities. The mobile system with robotic manipulator has been designed to go up and down stairs. For the dextrous handling, this manipulator will be designed as a redundant type to act like a human arm. Manipulator control system is to be extended easily for further usage with a modular architecture to get independency and reliability by minimizing EMI effects.

• 대한전자공학회논문지
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• 제25권12호
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• pp.1573-1581
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• 1988

In this paper, the analysis on the dual mode conical horn antennas is made to realize the optimum horn as the primary feed of the offset parabolic antenna for the domestic broadcasting satellite. Such analysis can give rise to the approximate equations and graphs on the beam width, which makes it possible to design the desired conical horn. It has been shown that the radiation charateristics of designed horn antenna built with the dielectric band inside the horn. The designed dual mode horn antenna may provide the useful basis to practical usage of the antenna in the domestic satellite broadcasting communication systems.

• 대한방사선기술학회지:방사선기술과학
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• 제43권5호
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• pp.389-395
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• 2020

The evaluation of radioactivated components of heavy-ion accelerator facilities affects the safety of radiation management and the exposure dose for workers. and this is an important issue when predicting the disposal cost of waste during maintenance and dismantling of accelerator facilities. In this study, the FLUKA code was used to simulate the proton treatment device nozzle and classify the radio-nuclides and total radioactivity generated by each component over a short period of time. The source term was evaluated using NIST reference beam data, and the neutron flux generated for each component was calculated using the evaluated beam data. Radioactive isotopes caused by generated neutrons were compared and evaluated using nuclide information from the International Radiation Protection Association and the Korea Radioisotope association. Most of the nuclides produced form of beta rays and electron capture, and short-lived nuclides dominated. However, In the case of ⁵⁴Mn, which is a radioactive product of iron, the effect of gamma rays should be considered. In the case of tritium generated from a material with a low atomic number, it is considered that handling care should be taken due to its long half-life.

• Nuclear Engineering and Technology
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• 제54권2호
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• pp.429-436
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• 2022

Investigations of retrospective dosimetry have shown that components of mobile phones are suitable as emergency dosimeters in case of radiological incidents. For physical dosimetry, components can be read out using optically stimulated luminescence (OSL), thermoluminescence (TL) and phototransferred thermoluminescence (PTTL) methods to determine the absorbed dose. This paper deals with a feasibility study of display glass from modern mobile phones that are measured by thermally assisted (Ta) optically stimulated luminescence. Violet (VSL, 405 nm) and infrared (IRSL, 850 nm) LEDs were used for optical stimulation and two protocols (Ta-VSL and Ta-IRSL) were tested. The aim was to systematically investigate the luminescence properties, compare the results to blue stimulated Ta-BSL protocol (458 nm) and to develop a robust measurement protocol for the usage as an emergency dosimeter after an incident with ionizing radiation. First, the native signals were measured to calculate the zero dose signal. Next, the reproducibility and dose response of the luminescence signals were analyzed. Finally, the signal stability was tested after the storage of irradiated samples at room temperature. In general, the developed Ta-IRSL and Ta-VSL protocols indicate usability, however, further research is needed to test the potential of a new protocol for physical retrospective dosimetry.

• 한국의학물리학회:학술대회논문집
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• 한국의학물리학회 2002년도 Proceedings
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• pp.267-268
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• 2002

Microbeam is a new avenue of radiation research especially in radiation biology and radiation protection. Selective irradiation of an ionizing particle to a targeted cell organelle may disclose such mechanisms as signal transaction among cell organelles and cell-to-cell communication in the processes toward an endpoint observed. Bystander effect, existence of which is clearly evidenced by application of the particle microbeam to biological experiments, suggests potential underestimation in the conventional risk estimation at low particle fluence rates, such as environment of space radiations in ISS (International Space Station). To promote these studies we started the construction of our microbeam facility (named as SPICE) to our HVEE Tandem accelerator (3.4 MeV proton and 5.1 MeV $^4$He$\^$2+/). For our primary goal, "irradiation of single particle to cell organelle within a position resolution of 2 micrometer in a reasonable irradiation time", special features are considered. Usage of a triplet Q magnet for focussing the beam to submicron of size is an outstanding feature compared to facilities of other institutes. Followings are other features: precise position control of cell dish holder, design of the cell dish, data acquisition of microscopic image of a cell organelle (cell nucleus) and data processing, a reliable particle detection, soft and hard wares to integrate all these related data, to control and irradiate exactly determined number of particles to a targeted spot.