• Journal of Radiation Protection and Research
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• 제30권1호
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• pp.17-25
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• 2005

원자력 발전의 안정성이 사회적 문제로 제기된 이후 작업종사자에 대한 작업 중 방사선 피폭량에 대한 관심이 높아지고 있다. 현재의 방법에 의하면 방사선 작업 계획의 수립 시 작업 공간 내 선량률이 일정하다는 가정 하에 피폭선량을 예측하므로 작업 경로에 따른 피폭선량의 변화에 대한 고려가 이루어지지 않고 있다. 본 연구에서는 작업자와 선원과의 거리가 고려되 수정된 방사선 피폭량 계산식을 이용하여 방사성 폐기물 저장시설에서의 작업 중 작업경로 변화에 따른 방사선 피폭량을 계산하였다. 이 계산식을 이용하여 주어진 작업 공간과 선원 조건하에서 작업 중 방사선 피폭량을 최소로 하는 최적 작업경로를 탐색할 수 있는 수치해석 알고리즘을 제안하였다. 이를 위하여 2차원 작업공간에서 무한개의 작업경로를 유한개의 경로로 근사화하고 근사화된 모든 작업경로 중 피폭선량이 최소가 되는 작업경로를 탐색하였다. 또한, 3차원 그래픽 기술과 Java 프로그래밍을 이용한 가상작업 시뮬레이션 프로그램을 개발하고 작업 공간의 선량률 가시화 및 가상 작업 시뮬레이션을 수행하여 방사선 작업 계획의 수립을 위한 도구로서의 가능성을 검토하였다. 수치해석 계산과 시뮬레이션 과정을 통하여 최적 작업경로는 작업자와 선원과의 거리를 증가시키고 작업 시간을 단축시킬 수 있는 경로로 제시되었고, 이를 바탕으로 방사선 피폭량은 작업시간뿐만 아니라 작업자와 선원간의 거리에 영향을 받음과 최적화된 방사선 방호를 위해 작업경로가 고려되어야 함을 확인하였다.

• Journal of Radiation Protection and Research
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• 제29권1호
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• pp.57-63
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• 2004

원자력발전소 가동중 검사의 일부로서 계획예방정비 기간중 수행되는 ECT 검사작업은 작업자의 과피폭 우려로 인해 방사선안전관리 대상으로 비중을 두고 관리감독이 이루어지고 있다. 정기적으로 반복되는 검사수행경험 사례 분석의 결과, ECT 검사작업 완료후 피폭결과가 방사선안전관리 목표선량을 상회하는 경우가 상당수 나타나고 있어서 개인별 피폭선량관리가 쉽지않고 방사선작업허가서 발급에도 지장을 초래하는 것으로 나타났다. 검사자의 피폭선량 저감을 위한 세심한 방사선작업계획 수립과 최적화된 방사선방호대책마련을 위한 지속적인 방사선작업 관련 자료 축적도 중요하다고 판단되나, ECT검사 방사선작업계획의 기본요소인 작업내용 및 작업소요시간, 작업인원에 대한 검토와 논의는 미미한 실정이다. 방사선작업계획 수립의 근간을 이루는 예상피폭선량표에 포함될 검사작업내용과 검사자 작업소요시간에 대하여 반복시험과 사례분석 결과를 제시하였다.

• 대한인간공학회지
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• 제24권2호
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• pp.71-77
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• 2005

In spite of the importance of nuclear power as one of major electric energies in Korea, the nuclear safety has become the most serious social issue in the operation of the nuclear power plant. In this paper, a virtual work simulation program was developed to predict exposure dose during radiation work in radwaste storage. The work simulation program was developed. using $Java ^{TM}$applet and VRML-virtual reality modeling language. A numerical algorithm to find the optimal work path which minimize exposure dose during the given work, was developed and exposure dose on the optimal work path was compared with that on the shortest path. Comparing with the shortest path for the given work, the predicted optimal path consumed longer work time by II% but reduced total exposure dose by 46%. The simulation result showed that the exposure dose depended on not only work time, but also the distance between the worker and the radiation source. The developed simulation program could be a useful tool for the planning of radioactive waste work to increase the radiation safety of workers.

• Journal of Radiation Protection and Research
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• 제47권2호
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• pp.93-98
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• 2022

Background: This study aims to derive the characteristics of each work type for industrial radiography based on empirical evidence through expert advice and a survey of radiation workers of various types of industrial radiography. Materials and Methods: According to a Korean report, work types of industrial radiography are classified into indoor tests, underground pipe tests, tests in a shielded room (radiographic testing [RT] room test), outdoor field tests, and outdoor large structure tests. For each work type, exposure geometry and radiation sources were mainly identified through the expert advice and workers' survey as reliable empirical evidence. Results and Discussion: The expert advice and survey results were consistent as the proportion of the work types were high in the order of RT room test, outdoor large structure test, underground pipe test, outdoor field test, and indoor test. The outdoor large structure test is the highest exposure risk work type in the industrial radiography. In most types of industrial radiography, radiation workers generally used ¹⁹²Ir as the main source. In the results of the survey, the portion of sources was high in the order of ¹⁹²Ir, X-ray generator, ⁶⁰Co, and ⁷⁵Se. As the exposure geometry, the antero-posterior geometry is dominant, and the rotational and isotropic geometry should be also considered with the work type. Conclusion: In this study, through expert advice and a survey, the external exposure characteristics for each work type of industrial radiography workers were derived. This information will be used in the reconstruction of organ dose for health effects assessment of Korean radiation workers.

• 방사선산업학회지
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• 제11권1호
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• pp.47-54
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• 2017

Compared to other occupations, there is a greater risk of exposure to radiation due to the use of radioisotopes in nuclear medicine for diagnostic evaluations and therapy. To consider ways to reduce exposure dose for those in nuclear medicine involved in injection work and elution work among radiation workers as well as for sanitation workers and trainees among frequent workers an investigation into exposure dose and situational analysis from changes in yearly exposure dose evaluations, changes in work environment and changes in forms of inspection were conducted. Exposure dose measurements were taken by using EPD MK2 worn during working hours for one injection worker, one elution worker, two sanitation workers, and one trainee at a general hospital in the Seoul area for three days from July 18th to 20th 2016. Radiation from radioisotopes which are a part of nuclear medicine can significantly affect not only radiation workers who deal with radioisotopes directly but also frequency works as well. According to this study the annual dose limit for elution workers and injection workers were considered safe as the amount of exposure was not large enough to have a significant effect. The limits of this study consist in the duration of this study and the quantity of participants. Also there was a limitation of the measurement device involving accumulated exposure, where the EPD MK2 cannot check the changes in exposure according to a particular activity.

• 한국방사선학회논문지
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• 제17권2호
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• pp.267-275
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• 2023

전 세계적으로 방사선종사자들의 피폭 기록은 관심의 대상이며 피폭이 일어나는 분야에 대한 분석이 수행되고 있다. 한국에서는 유관부처에 따라 보건복지부, 농림축산식품부, 원자력안전위원회에서 종사자들의 피폭을 11개 업종으로 나누어 기록을 수집 분석하고 있다. 그러나 이러한 분류 체계는 유엔방사선영향과학위원회를 비롯한 주요 국가들의 분류 체계와는 정합성이 부족하다. 국내의 종사자 피폭 분류 체계는 명확한 분류 기준이 없고 업종 특성 등을 반영해주지 못하고 있다. 유엔방사선영향과학위원회의 분류 체계를 바탕으로 국내의 분류 체계를 핵주기 분야, 의료분야, 산업분야, 그 외 분야(교육/연구, 군사/공공)의 5개 대분류 체계와 그에 따른 세 분류 및 직군 분류를 본 연구를 통해 제안하였다.

• Safety and Health at Work
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• 제12권4호
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• pp.445-451
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• 2021

Background: This study aimed to evaluate the reliability and validity of the self-administered questionnaire for Korean radiation workers. Methods: From May 24, 2016, to June 30, 2017, 20,608 participants completed the questionnaire, providing information on sociodemographics, lifestyle, work history and practices, medical radiation exposure, and medical history, which was linked to the National Dose Registry and the National Cancer Registry. The validity of the questionnaire was evaluated using the responses of 20,608 workers, and reliability was evaluated using the responses of 3043 workers who responded to the survey twice. Results: Responses concerning demographic characteristics and lifestyle showed reliability with a moderate-to-high agreement (kappa: 0.43-0.99), whereas responses concerning occupation and medical radiation exposure had a wide range of agreement (kappa: 0.05-0.95), possibly owing to temporal variability during employment. Regarding validity, responses to the question about the first year of employment had an excellent agreement with the national registry (intraclass correlation coefficient = 0.9); however, responses on cancer history had a wide range of agreement (kappa: 0.22-0.85). Conclusion: Although the reliability and validity of the questionnaire were not distinguished by demographic characteristics, they tended to be low among participants whose occupational radiation exposure was minimal. Overall, the information collected can be reliable for epidemiological studies; however, caution must be exercised when using information such as medical exposure and work practices, which are prone to temporal variability.

• Journal of Radiation Protection and Research
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• 제48권3호
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• pp.162-166
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• 2023

Background: Assessment of the radiation doses to which workers are exposed can differ depending on the placement of dosimeters on the body. In addition, it is affected by whether the placement is under or over a shielding apron. This study aimed to evaluate the actual positioning of personal dosimeters on the body, with or without shielding aprons, among radiation workers in Korea. Materials and Methods: We analyzed the survey data, which included demographic characteristics, such as sex, age, occupation, work history, and placement of the personal dosimeter being worn, from a cohort study of Korean radiation workers. We assessed the use of personal dosimeters among workers, stratified by sex, age, working period, starting year of work, and occupation. Results and Discussion: Overall, high compliance (89.1% to 99.0%) with the wearing of dosimeters on the chest was observed regardless of workers' characteristics, such as age, sex, occupation, and work history. However, the placement of dosimeters, either under or over the shielding aprons, was inconsistent. Overall, 40.1% of workers wore dosimeters under their aprons, while the others wore dosimeters over their aprons. This inconsistency indicates that radiation doses are possibly measured differently under the same exposure conditions solely owing to variations in the placement of worn dosimeters. Conclusion: Although a lack of uniformity in dosimeter placement when wearing a shielding apron may not cause serious harm in radiation dose management for workers, the development of detailed guidelines for dosimeter placement may improve the accuracy of dose assessment.

• 한국산학기술학회논문지
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• 제22권2호
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• pp.418-426
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• 2021

이 연구는 방사선 발생장치 제조업체 종사자와 의료기관 종사자들 간의 방사선안전관리에 대한 인식을 알아보고 적극적인 대처능력과 안전수준을 향상시키는데 기초자료로 활용하기 위하여 연구조사하게 되었다. 방사선에 대한 지식, 태도 실천 점수는 성별, 연령, 결혼상태, 직종, 직위, 현 직장근무기간, 직장 총 근무기간, 방사선 관련 유사업무 유무, 매뉴얼 비치 여부, 방어 시설유지 여부, 방어 장비보유 수, 방사선 안전교육 여부, 특수건강검진 여부, 방사선 용어인지 여부와 관련이 있었으며, 특히 방사선 관련 직종에서 방사선사의 지식 점수가 가장 높았다(p<0.05). 방사선 안전관리는 방사선제조업체 종사자 및 의료기관 종사자 모두 방사선 노출에 적극적인 방어 노력이 필요하며방사선 안전관리를 위해서는 지침 준수, 주기적인 교육, 시설보강, 매뉴얼 작성, 특수 건강검진 등 제도적 장치가 필요하다.

• 한국농촌생활과학회지
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• 제7권2호
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• pp.121-128
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• 1996

This study was performed to define the effects of Far Infrared Ray Radiation Fabrics as summer garments during outdoor work by human trial. One healthy male subject was volunteered for this study. Experimental garments consisted of three kinds of trousers (Cotton, Cotton/linen blended, Far Infrared Ray Radiation Fabric/wool blended) and basic garments (panty, socks, shirts, and dress shirts). The measurements were rectal temp., skin temp., microclimate inside clothing, heart rate, subjective sensation etc. The results were as follows : 1. Rectal temperature showed the lowest in Far Infrared Ray Radiation Fabrics among 3 garments. 2. Skin temperature (forehead, chest abdomen temp.) and mean skin temperature were lower in Far Infrared Ray Radiation Fabrics than in others, especially during early stage of work. 3. Heart rate showed lower value in Far Infrared Ray Radiation Fabrics than in others but there was no significance among the garments. 4. Humidity inside clothing and total weight loss showed the highest value in Far Infrared Ray Radiation Fabrics.