• Journal of Radiation Protection and Research
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• 제42권4호
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• pp.205-211
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• 2017

Background: Radiation is used in a variety of areas, but it also poses potential risks. Although radiation is often used with great effectiveness in many applications, people perceive potential risks associated with radiation and feel anxious about the possibility of radiation exposure. Various methods of measuring radiation doses have been developed, but there is no way for the general public to measure their doses with ease. Currently, many people use smartphones, which provide information about the location of an individual phone through network connections. If a smartphone application could be developed for measuring radiation dosage, it would be a very effective way to measure individuals' radiation doses. Thus, we conducted a survey study to assess the social acceptance of such a technology by the general public and their intent to use that technology to measure radiation doses, as well as to investigate whether such an intention is correlated with anxiety and attitudes toward the use of radiation. Materials and Methods: A nationwide online survey was conducted among 355 Koreans who were 20 years old or older. Results and Discussion: Significant differences were found between the genders in attitudes, perceptions of radiation risk, and fears of exposure to radiation. However, a significant difference according to age was observed only in the intent to use a smartphone dose measurement application. Attitudes towards the use of radiation exerted a negative effect on radiation risk perception and exposure anxiety, whereas attitudes towards the use of radiation, risk perception, and anxiety about exposure were found to have a positive impact on the intent to use a smartphone application for dose measurements. Conclusion: A survey-based study was conducted to investigate how the general public perceives radiation and to examine the acceptability of a smartphone application as a personal dose monitoring device. If such an application is developed, it could be used not only to monitor an individual's dose, but also to contribute to radiation safety information infrastructure by mapping radiation in different areas, which could be utilized as a useful basis for radiation research.

• Journal of Radiation Protection and Research
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• 제38권4호
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• pp.185-188
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• 2013

Heating method using electric heater was used to reduce water content in fingernail clippings. Authors found that low water content is helpful to measure EPR signal of fingernail sample with enhanced variability. Generally, natural dehydration happens in normal room condition at least one month and needs much time for using in experiment. So, artificial heating method is applied in this study for time savings. Fingernail samples were tested to find effect of water content to the EPR signal on microwave power levels for dosimetry. Low water content in fingernail reduced variability of EPR signal and makes it possible to measure accurate EPR signal. It also made it possible to measure constant movement of EPR signals on several microwave power levels. Although this method was difficult to apply directly in fingernail/EPR dosimetry, we, authors, believe that this heating method would be useful to differentiate MIS2 and RIS which are generally located at the same g-factor and almost impossible to be identified with each other.

• 한국콘텐츠학회논문지
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• 제14권11호
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• pp.864-870
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• 2014

선량계 유용성을 평가하기 위한 방법으로 방사선관계종사자의 피폭선량을 측정하여 개인피폭관리를 위한 선량계 선택의 기초 자료를 제시하고자 하였다. 2012년 1년간 방사선사 30명을 대상으로 하였으며 개인피폭 누적선량을 측정하여 열형광선량계, 형광유리선량계, 광자극발광선량계의 성능을 조사하였다. 연구방법으로는 DAP와 ion-chamber를 이용하여 세종류 개인피폭선량계의 선량측정값을 비교 분석하였으며 의료기관별, 검사업무별, 분기별 방사선관계종사자의 피폭누적선량을 확인하였다. 결과적으로 직접 X선조사를 통한 개인피폭선량계의 선량값과 ion-chamber의 절대값에서 광자극발광선량계가 열형광선량계나 형광유리선량계에 비해 더 유사한 선량값을 나타내 측정 능력면에서 더 우수한 결과를 나타냈다. 또한 방사선발생구역에서 방사선관계종사자의 피폭선량이 광자극발광선량계에서 보다 높게 나타났다.

• 대한방사선방어학회:학술대회논문집
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• 대한방사선방어학회 2009년도 추계 학술발표
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• pp.208-209
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• 2009

• Radiation Oncology Journal
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• 제12권2호
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• pp.201-207
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• 1994

To objectively compare the response of the palliative radiotherapy in bone metastatic patients which decreases pain and prevents pathologic fractures, we introduced and applied the RTOG pain and narcotic measure system. From Oct in 1991 to July in 1993, thirty-two patients with painful bone metastases, 17 of them were solitary lesions and others were multiple lesions, were treated with mainly 6 MV photon otherwise 15 MV photon. Radiation doses to bone metastatic sites ranged about from 2000 to 4600cGy. Responses of radiation therapy were compared with days of pre-RT, RT finish, 3, 6, 9 months after the start of RT and solitary versus multiple lesions and follow up scores according to the RTOG measure system. Survival analysis was done. Pain and narcotic score of the entire patients were 7.3, 7.8 at the pre-RT period and 2.6, 3.9 at the immediate or 2 weeks after RT, which was $64{\%},\;50{\%}$ decrement compared with the pre-RT score, Pain scores of 3, 6 and 9 months after the beginning of irradiation were 3.6, 3.7 and 3.3. The best response found in the breast and prostate primaries was $84\%,\;78\%$ decrement of pain score as compared with pre-RT score(statistically insignificant). Median survival was 5.5 months and mean survival was 5 months. We conclude that the RTOG pain and narcotic measure system is relatively effective scale in the comparison of before and after palliative irradiation to the painful bone metastatic sites but more detailed parameters will be required in the narcotic scoring system. More aggressive but less or similiar toxic radiotherapy is needed in the patients having relatively long life expected time.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.1220-1224
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• 2003

In this paper, we measured the radiation dose of a fuel handling machine of the CANDU type Wolsong nuclear reactor directly during operation, in spite of the high radiation level. In this paper we will describe the sensor development, measurement techniques, and results of our study. For this study, we used specially developed semiconductor sensors and matching dosimetry techniques for the mixed radiation field. MOSFET dosimeters with a thin oxide, that are tuned to a high dose, were used to measure the ionizing radiation dose. Silicon diode dosimeters with an optimum area to thickness ratio were used for the radiation damage measurements. The sensors are able to distinguish neutrons from gamma/X-rays. To measure the radiation dose, electronic sensor modules were installed on two locations of the fuel handling machine. The measurements were performed throughout one reactor maintenance cycle. The resultant annual cumulative dose of gamma/X-rays on the two spots of the fuel handling machine were 18.47 Mrad and 76.50 Mrad, and those of the neutrons were 17.51 krad and 60.67 krad. The measured radiation level is high enough to degrade certain cable insulation materials that may result in electrical insulation failure.

• 한국임상수의학회지
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• 제41권3호
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• pp.157-164
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• 2024

The standard radiation protection method in the angiography suite involves the use of a thyroid shield, a lead apron, and lead glasses. However, exposure to substantial amounts of ionizing radiation can cause cataracts, tumors, and skin erythema. A newly developed curtain-type radiation protection device consists of a curtain drape composed of a five-layer bismuth and lead acrylic head-shielding plate, with both bearing an equivalent 0.25 mm lead thickness. In this study, a quality assurance phantom was used as the patient to create radiation scatter from the radiographic source, and an anthropomorphic mannequin phantom was used as the interventionalist to measure the radiation dose at seven different anatomical locations. Thermoluminescent dosimeters were used to measure the radiation dose. The experimental groups consisted of all-sided or one-sided curtain set-ups, the presence or absence of a conventional shielding system, and the orientation of beam irradiation. Consequently, the curtain-type radiation protection device exhibited better radiation protection range and capabilities than conventional radiation protection systems, especially in safeguarding the forehead, eyes, arms, and feet, with minimal radiation exposure. Moreover, the mean shielding ratios of the conventional shielding system and curtain-type radiation protection device were measured at 51.94% and 93.86%, respectively. Additionally, no significant decrease in the radiation protection range or capability was observed, even with changes in the beam orientation or one-sided protection. Compared with a conventional shielding system, the curtain-type radiation protection device decreased radiation exposure doses and improved comfort. Therefore, it is a potential new radiation protection device for veterinary interventional procedures.

• 센서학회지
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• 제6권3호
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• pp.228-236
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• 1997

방사성 물질은 인체에 매우 위험하여 정확한 제어와 유출 방지 및 정확한 측정의 필요성이 요구된다. 본 논문에서는 GM 계수기를 사용하여 방사성 물질의 양을 정확히 측정할 수 있는 시스템을 설계하였으며, 계수 프로그램과 측정한 데이터를 저장하거나 외부 장치로 전송향 수 있는 운용 프로그램을 개발하였다. 제작한 시스템과 계수 프로그램은 국내외에서 개발하고 있는 GM 계수관형 방사선 측정기로 원자력 발전소 및 연구소에서 띠러 가지 방식으로 활용될 수 있도록 설계되었다.

• 한국방사선학회논문지
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• 제2권1호
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• pp.11-16
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• 2008

방사선은 의학, 이공학, 농학, 기타 산업분야 등에서 사용영역이 매우 넓고 방사선이용기술의 개발로 방사선의 이용 빈도는 계속 증가되고 있다. 방사선의 인류에 대한 공헌은 지대하지만 생체에 미치는 영향으로 인하여 방사선에 의한 장해 또한 간과할 수 없는 부분이다. 방사선을 유효적절하게 이용하면서 장해를 방지하기 위해서는 방사선을 정확하게 계측하여야 하며 이에 따른 연구와 교육이 철저하게 이루어 져야만 한다. 본 연구에서는 유비쿼터스 컴퓨팅기술을 이용하여 생체에 유해한 작용을 하는 방사선을 방사선선원에 접근하지 않고 무선으로 시간과 장소에 제한 없이 방사선을 계측할 수 있는 방안을 제안하였다. 제안된 방안의 구현은 무선전송 기술은 CDMA망을 이용하였고, 임베디드시스템(embedded system)을 PDA에 내장한 후, 고정된 IP를 가지는 방사선계측시스템에 PDA를 CDMA망에 접속하여 계측값을 디스플레이 하였다. 본 연구에서 제안된 방안을 이용한다면 인간이 유해한 방사선선원에 접근하지 않고 선원에 배치된 고정된 IP를 가지고 있는 방사선계측시스템을 통하여 CDMA망으로 PDA에 표시된 계측값을 읽을 수 있게 될 것이다.

• 한국전자파학회논문지
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• 제20권7호
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• pp.625-630
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• 2009

본 논문에서는 함정에 탑재된 탐색 레이다의 선호 왜곡 현상에 대한 분석 및 대책에 대해 소개한다. ShipEDF 프로그램을 이용하여 탐색 레이다의 주 안테나와 함정 구조물을 전자기학적으로 모델링하고, 광선 추적 기법을 이용하여 탐색 레이다의 자유공간 및 함정 탑재 상태에서의 복사 패턴을 분석한다. 분석된 복사 패턴을 통해 탐색 레이다의 선호 왜곡 현상이 마스트의 전자파 반사로 인한 복사 패턴 왜곡에 의한 것임을 알 수 있었고, 이에 대한 대책 수립을 위해 탐색 레이다에 의한 마스트 표면 전류 분포를 분석한다.