• 한국환경보건학회지
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• 제46권1호
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• pp.96-102
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• 2020

Objectives: This study identified factors impacting radiation knowledge among aircrew, who are affected by cosmic radiation exposure due to their occupational environment. Methods: In September 2019 we conducted an online survey of aircrew through a Google link. We evaluated the level of radiation knowledge using a ten-item (10 points) questionnaire. The following exploratory variables were evaluated in relationship with the level of radiation knowledge using univariable linear regression models: sex, age, duration of employment, position level, company, marriage, education level, personal/family history of disease, and the number of times acquiring information on radiation through various channels (internet searching, watching television, reading newspaper, conversation about radiation with aircrew/non-aircrew, in-house training). With a p of 0.2 in univariable models, we built a multivariable linear regression model using a stepwise selection method. Results: The average radiation knowledge score of the 356 respondents was 7.22. Univariable linear regression analysis showed that radiation knowledge of the aircrew was associated with their company, position level, age, and number of conversations with other aircrew members. Our multivariable model showed that the radiation knowledge level of aircrew decreased as they had more conversations about radiation with other aircrew members and as their age increased. Conclusions: Korean air crew showed a lower level of radiation knowledge as their age and the number of conversations with colleagues increased. The study suggests that more education is needed in order for aircrew to gain accurate radiation knowledge.

• Journal of Radiation Protection and Research
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• 제29권2호
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• pp.141-150
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• 2004

특정 비행노선에서 우주선에 의한 누적선량을 계산하는 프로그램인 CARI-6를 이용하여 비행고도 우주선 방사선장의 선량률 변화 특성을 분석하고, 국적항공사에서 운행하는 전 국제선 노선에 대한 노선별 우주선 피폭선량을 산출하였다. 산출한 노선별 선량을 항공승무원의 비행스케쥴과 국민의 항공여행 통계에 적용하여 우리나라 항공승무원과 일반 여행객의 우주선에 의한 연간 피폭선량과 집단유효선량을 평가하였다. 평가 결과, 항공승무원의 피폭이 일반인의 선량한도인 연간 1 mSv를 초과하여 평균 2.62mSv로 다른 직업상 피폭을 받는 직군의 선량과 대등한 것으로 평가되었다. 따라서 항공승무원 적군의 우주선 피폭을 일종의 직업상 피폭으로 간주함이 타당함을 확인하였다. 나아가 국민의 해외여행으로 인한 집단선량은 2001년 기준으로 1,100만 명의 출입국자가 총 136man-Sv를 피폭한 것으로 나타났다. ICRP 92에서 양성자와 중성자의 방사선가중치를 변경한 결과를 반영하여 비행고도에서의 우주선 방사선장 정보가 수정될 경우 위의 평가 결과는 보완되어야 한다.

• 한국항공운항학회지
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• 제26권2호
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• pp.91-97
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• 2018

High-energy charged particles are comprised of galactic cosmic rays and solar energetic particles which are mainly originated from the supernova explosion, active galactic nuclei, and the Sun. These primary charged particles which have sufficient energy to penetrate the Earth's magnetic field collide with the Earth's upper atmosphere, that is $N_2$ and $O_2$, and create secondary particles and ionizing radiation. The ionizing radiation can be measured at commercial flight altitude. So it is recommended to manage radiation dose of aircrew as workers under radiation environment to protect their health and safety. However, it is hard to deploy radiation measurement instrument to commercial aircrafts and monitor radiation dose continuously. So the numerical model calculation is performed to assess radiation exposure at flight altitude. In this paper, we present comparison result between measurement data recorded on several flights and estimation data calculated using model and examine the characteristics of the radiation environment in the atmosphere.

• Safety and Health at Work
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• 제14권4호
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• pp.451-456
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• 2023

Background: We conducted a case-control study to identify high-risk occupations and exposure to occupational hazards for acute myeloid leukemia (AML). Methods: When patients with AML admitted to the Department of Hematology in the study hospital for the first time are referred to the Department of Occupational and Environmental Medicine, data on occupation are collected by investigators to evaluate work-relatedness. Community-based controls were recruited through an online survey agency, and four controls per case were matched. Occupational information was estimated using structured questionnaires covering 27 specific occupations and 32 exposure agents. Conditional logistic regression analysis was performed by pairing cases and controls. Results: In the analysis of the risk of AML according to occupational classification, a significant association was found in paint manufacturing or painting work (OR = 2.22, 95% CI: 1.03-4.81) and aircrew (OR = 6.00, 95% CI: 1.00-35.91) in males, and in pesticide industry (OR = 6.89, 95% CI: 1.69-28.07) and cokes and steel industry (OR = 2.00, 95% CI: 1.18-22.06) in ≥60 years old. Moreover, the risk of AML increased significantly as the cumulative exposure to thinners increased. In the analyses stratified by sex and age, the association between pesticide exposure and AML was significant in males (OR = 3.28, 95% CI: 1.10-9.77) and in ≥60 years old (OR = 6.22, 95% CI: 1.48-26.08). Conclusion: This case-control study identified high-risk occupational groups in the Republic of Korea including paint manufacturers and painters, aircrew, and those who are occupationally exposed to pesticides or paint thinners.

• Journal of Radiation Protection and Research
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• 제38권1호
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• pp.44-51
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• 2013

상대적으로 높은 항공승무원의 우주방사선 피폭을 고려하여 ICRP는 직무피폭의 일부로 간주하고 방사선 방호 대상으로 권고하였으며 이미 유럽 등 일부 국가에서는 항공 고도에서의 항공승무원에 대한 우주방사선 피폭 관리가 이루어지고 있다. 국내에서도 2012년 7월 26일 생활주변방사선안전관리법의 시행과 더불어 항공승무원에 대한 관리 기준이 마련되었다. 본 연구에서는 항공승무원의 개인 선량 평가에서 휴대가 용이한 누적형 고체비적검출기의 적용가능성을 검토하기 위해 수행되었다. 한국표준과학연구원에서 $^{252}Cf$ 중성자 표준 선원을 이용해 선량계의 중성자 선량에 대한 반응도의 선형성과 중성자 입사각에 따른 각도의존성을 평가하였고 한국민간항공조종사협회의 협조를 얻어 항공 고도에 선량계를 노출시켰다. 응답 특성 평가 결과, 선형성에서는 각각의 감속재에 대해 모두 상관계수($r^2$)가 0.99 이상으로 높았고 큰 각도의존성을 나타내었다. 또한 예측된 운항 승무원의 중성자 선량과 비적 밀도와의 상관성은 각각의 감속재에 대하여 r=0.486 (HDPE), r=0.241 (PA)으로 낮게 평가되었다. 누적형 중성자 선량계는 개인 피폭 선량 평가에 활용 가능성이 있을 것으로 판단되나 항공 고도에서의 중성자 에너지 스펙트럼을 고려하여 추가적인 연구가 필요하며 노출 시간을 증가시켜 비적 밀도와의 상관성을 보다 면밀하게 평가할 필요가 있다.