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Abstract
This study identified characteristics of occupational radiation doses among Korean radiation workers from 1984-2020 using the National Dose Registry. The overall mean effective dose from 1984-2020 was 1.05 mSv y -1 , with the highest mean effective dose of 2.61 mSv y -1 for non-destructive testing workers. The mean effective dose gradually decreased from 2.97 mSv in 1984 to 0.34 mSv in 2020. The largest decline ratio between 1984 and 2020 was observed in educational institutions at 97.4% (0.84 mSv in 1984 and 0.02 mSv in 2020), followed by industries at 96.5% (2.55 mSv in 1984 and 0.09 mSv in 2020). Compared to 1984, the individual dose-distribution and collective dose-distribution ratios in 2020 decreased by 82.6-99% and 53.7-94.7%, respectively. This downward trend was consistent in all occupations, while decline characteristics were different depending on occupation types, work experience, and changes in radiation safety regulations. Considering that some changes in radiation doses in the registry could be solely based on changing the recording mode regardless of the actual changes in radiation doses, a careful understanding of radiation doses in the registry is particularly relevant for future epidemiological studies.

1984-2020년 간 개인 피폭선량을 업종, 선량계, 성별, 연령별 다각도로 층화하여 선량 변화를 살펴보았습니다. 전반적인 피폭선량 감소추세가 모든 특성에서 공통적으로 나타납니다.

1984-2020년 간 개인 피폭선량을 선량초과자수 분포율(NRe)과 집단선량분포율(SRe)로 살펴보았을 때, 1984년-2020년까지 점진적 감소가 이루어졌습니다. 이러한 변화양상은 특정시기에 피폭선량 관련 규제·규정 변화에 영향을 받는 모습 또한 나타납니다.

Affiliations

Eunbi Noh 1, Dalnim Lee 1, Sunhoo Park 1, Sun Dong Ju 2, Ji-Hye Kim 2, Songwon Seo 1
1National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences, Seoul, Republic of Korea.
2Radiation Safety Division, Korea Foundation of Nuclear Safety, Gyeonggi-do, Republic of Korea.