Radiat Prot Dosimetry. 2026 Jul 28:ncag085. doi: 10.1093/rpd/ncag085. Online ahead of print.
ABSTRACT
Long-term standardized personal dose monitoring is essential for occupational radiation protection and health risk assessment of radiation workers. This study aimed to analyse the distribution characteristics, major causes, and actual exposure risks of abnormal individual dose monitoring results among radiation workers in Beijing from 2021 to 2025. A 5-year large-sample analysis of abnormal individual dose data among local radiation workers was performed to systematically explore the key problems in daily dose monitoring management. A total of 286 339 person-times of occupational external exposure monitoring (Hp(10)) were included, and 313 records exceeding the quarterly investigation level of 1.25 mSv were selected for retrospective investigation and statistical analysis. The overall 5-year abnormal rate was 0.11%, with no significant annual variation. Most abnormal cases were concentrated in medical institutions, especially in diagnostic radiology and interventional radiology. Non-standard behaviours such as improper placement and irregular wearing of dosemeters were the main causes of false abnormal doses, accounting for the majority of over-threshold records. Only 46 cases were confirmed as actual occupational exposure, and all quarterly doses were below 3 mSv. Interventional radiology personnel had a significantly higher actual exposure fraction than other radiation worker groups, with both the highest proportion of exposed individuals and the largest collective occupational exposure dose. The overall occupational exposure level of radiation workers in Beijing remained under effective control during the study period. In conclusion, inappropriate dosemeter management is the primary factor leading to abnormal monitoring data. Targeted radiation protection training and standardized dose supervision should be strengthened for high-risk groups, especially interventional radiology workers, to improve the authenticity and effectiveness of occupational dose monitoring and optimize regional radiation protection management.
PMID:42520320 | DOI:10.1093/rpd/ncag085
