[Survey of Occupational Exposure and Analysis of Actual Exposure Status for FY2018-2022].

Abstract

Understanding the trends in occupational radiation exposure is important for raising awareness of radiation protection. However, there have been no reports on the trends in exposure since the fiscal year 2018. In this resource, occupational exposure in the medical/radiological and nuclear fields from 2018 to 2022 was investigated, and the annual trends were evaluated. The method used was to organize the average/group doses using comprehensive statistical data on individual doses. In addition, the "dose lower limit index value" was set to 0.1, 1, and 20 mSv/y, and each group was analyzed. As a result, the majority of doses were below the detection limit, and there was no annual change in this proportion. There was no significant annual change in the average dose. Many radiologic technologists and doctors were over 0.1 and 1 mSv/y, but this has been decreasing since 2018. More than half of the people were doctors at over 20 mSv/y. However, medical care may not be reflected in dose data. No nuclear power workers received more than 20 mSv/y, and there was almost no annual change in any group. By setting the "dose lower limit index value" and conducting analysis, the individual dose and its annual change can be evaluated for workers who have been actually exposed to radiation.