本文用扫描电镜观察 3例放疗后乳腺癌、3例脑瘤患者及 33名铀矿井下作业人员的头发 ,比较了它们之间的差别并讨论了产生的原因。观察结果表明 :头发毛小皮微细结构的变化均随放疗累积剂量及矿工氡子体累积暴露量的增加而加重。而放疗后脑瘤患者毛小皮出现更明显的粘连、鳞片脱 Scanning electron microscopy was used to observe the hair of 3 cases of breast cancer after radiotherapy, 3 cases of brain tumors and 33 uranium mine workers. The differences between them were compared and the reason for this was discussed. The observation results show that the changes in the micro-structure of the hair hairs are aggravated by the cumulative dose of radiotherapy and the cumulative exposure of miners. The hair follicles of patients with brain tumors after radiotherapy showed more obvious adhesions and scales.