Abstract: Objective To investigate the health effects of low dose ionizing radiation on radiation workers in medical institutions. Methods The physical examination data of 2 412 radiation workers of grade A hospitals, who underwent occupational health examination in 2017, 2019 and 2021, were retrospectively analysed. Results 1) the routine blood abnormality rate in these years was 58.6%, 45.9% and 59.1% respectively, with the abnormal rate of women clearly higher than that of men; 2) the abnormal rate of liver function and abdominal colour ultrasound of men was higher than that of women, with significant differences; 3) the abnormal rate of ocular lens and abdominal colour ultrasound tended to increase distinctly with age and length of service; 4) there's no statistical difference in the abnormal rate of blood routine, ocular lens, electrocardiogram, micronucleus and abdominal colour ultrasound between different jobs. Conclusion Long-term low doses of ionizing radiation to the health of radiation workers have some negative effects, mainly for routine blood leukocyte, hemoglobin and red blood cells decline, eye lens cortex different levels of turbidity, abnormal electrocardiogram (ecg), fatty liver, liver kidney stones, etc., some abnormalities may be associated with gender, age, service age, and type of work. Radiation protection and occupational health examination for radiation workers should be strengthened.

Key words: Radiation worker, Ionising radiation, Occupational health examination