Abstract: Objective To understand the overall situation of peripheral blood cell count of radiation workers under long-term low-dose ionizing radiation,so as to provide basis for improving radiation protection measures and ensuring occupational health of radiation workers. Methods A total of 1 307 radiation workers in Jiangsu Province in 2021 were selected as the research subjects. According to different post status,gender,age,working age,nature and rank of work unit,the overall situation of peripheral blood cell of radiation workers was compared and analyzed. Results Among 1 307 radiation workers in Jiangsu Province in 2021,number of workers with on-the-job health examination was the largest（85.5%）,while the number of workers with pre-job（7.2%） and off-post（7.3%） health examination was the smallest. The number of white blood cell count（WBC）,lymphocyte count（LYM） and neutrophil count（NEU） of the off-post radiation workers were the lowest,while those of the pre-job radiation workers were the highest,and the differences among the three groups were statistically significant（F=10.025,20.618,3.111,all P<0.01）. Among the on-the-job radiation workers,the level of WBC in females was lower than that in males（F=5.408,P<0.01）,and WBC abnormality rate was higher than that in males（χ²=3.980,P<0.05）. There was statistically significant difference in WBC among different age groups（F=6.914,P<0.01）,and the WBC was the lowest among workers aged 41-<51 years old. There was statistically significant difference in WBC among different working-age groups（F=4.982,P<0.01）,and the WBC in workers with 21-<31 years of working-age was the lowest. Among white blood cell classification count,the difference in decreased neutrophils（NEU） was statistically significant among different working-age groups. The level of WBC of radiological workers in nuclear power industry was lower than that of medical radiological workers（P<0.05）,mainly decreased neutrophils. Among medical radiological workers,the level of WBC in provincial hospitals was the lowest,while that in district hospitals was the highest（F=22.388,P<0.01）. Conclusions Among 1 307 radiation workers in Jiangsu Province in 2021,the long-term low-dose ionizing radiation affect white blood cell classification count levels,and WBC of radiation workers in nuclear power industry is lower than that of medical radiation workers. The workers who are female,senior working age,engaged in nuclear power industry and provincial hospitals are more likely to have lower occupational WBC. So daily management and radiation protection of these people should be further strengthened.

Key words: Radiation workers, Ionizing radiation, White blood cell count, Occupational health