Abstract: A medical assessment of 7 workers suspected of receiving undue radiation was conducted through dose estimations, clinical observations, laboratory examinations, psychological assessments,etc. The causes for the incident were analyzed, and suggestions were made. It shows their estimated dose was normal. The symptom of dizziness was common, the laboratory examinations showed that the number of blood cells was normal, and the immune indexes of some workers were fluctuated. With a comprehensive analysis, it is believed that the workers are less likely to be overexposed, and the suspected incident was caused by human factors. In order to prevent the similar incidents, it is necessary for the company, to which they belong, to strengthen personal radiation protection measures, training and management of radiation workers.

Key words: Radiation workers, External exposure, Personal dose, Radiation protection