Analysis of abnormal results in personal dose monitoring of radiation workers in Chongqing, China from 2021 to 2024

This study investigates and analyzes the abnormal results of personal dose monitoring among radiation workers in Chongqing from 2021 to 2024, aiming to provide a scientific basis for occupational health management and radiation protection practices. The Registration Form for Investigation of Occupational External Exposure Individual Monitoring Doses was issued to individuals whose single monitoring results exceeded the investigation level. Detailed investigations were conducted to identify the causes of abnormal doses, including on-site radiation protection testing when necessary. From 2021 to 2024, a total of 1043 abnormal personal doses were recorded among 182 014 monitoring instances, yielding an abnormal rate of 0.57%. Diagnostic radiology and interventional radiology workers accounted for the majority of cases, at 64.43% and 22.53%, respectively. Most abnormal doses were below 5 mSv (72.48%). The primary causes included improper dosemeter usage (75.74%), increased workload (14.29%), and unidentified reasons (9.97%). The actual exposure rate was significantly higher among interventional radiology workers (47.66%) and those in tertiary hospitals (28.67%). Strengthening radiation protection training, improving dosemeter usage compliance, and optimizing workload management are essential to reduce abnormal doses. Special attention should be given to interventional radiology workers and tertiary hospital staff to mitigate occupational radiation risks.