To understand the individual dose of external irradiation of radiation workers in a class III medical institution in Guangzhou, and to provide scientific basis for radiation health protection management.

Thermoluminescence dosimetry was used to monitor the individual dose of radiation workers in a third class medical institution in Guangzhou in 2020, and the monitoring data were analyzed.

A total of 182 people participated in personal dose monitoring, including 84.6% (154/182) of X-ray imaging diagnosis staff and 15.4% (28/182) of interventional radiology staff. A total of 566 people were monitored in phase Ⅳ, including 470 X-ray imaging diagnosis staff and 96 interventional radiology staff. The monitoring rate initially increased in phase Ⅰ, Ⅱ and Ⅲ and decreased in phase Ⅳ. 55.5% (101/182) of the total number of monitoring personnel have completed four annual monitoring periods of personal dose. The individual dose equivalent in a single quarter was in the range of survey level (＞1.25 mSv), which were 1.56 mSv, 1.32 mSv and 2.59 mSv, respectively. The average annual effective doses of X-ray imaging diagnosis and interventional radiology were 0.42 (0.27, 0.93) mSv/A and 0.59 (0.17, 0.78) mSv/a, respectively. There was no significant difference between them (P＞0.05). The average annual effective doses of lead clothing for internal and external people were 0.40 (0.16, 0.81) and 0.72 (0.29, 0.91), respectively. The difference was statistically significant (Z=-4.395, P＜0.05). 70.8% (68/96) of the interventional radiology workers were exposed to more external lead than internal lead; 29.2% (28/96) of the cases in which the internal dose of lead was greater than the external dose.

The hospital should further strengthen the management of radiation workers, reduce the radiation dose and prevent the occurrence of radiation diseases.