快中子照射治疗头颈部肿瘤时，颈骨同时处于照射范围内，是否能引起耳蜗损伤尚未见报道。用动物实验方法证实快中子照射豚鼠头部后引起耳蜗超微结构的改变。32只豚鼠用于扫描电镜观察，每组8只，分为4组，分别用2，6，10及15Gy剂量照射。中子束能量最大时为50．SMev，平均为24M Fast neutron irradiation treatment of head and neck cancer, neck at the same time in the irradiation range, whether it can cause cochlear damage has not been reported. Animal experiments confirmed fast neutron irradiation guinea pig head caused by changes in cochlear ultrastructure. Thirty-two guinea pigs were used for scanning electron microscopy. Each group of 8 guinea pigs were divided into 4 groups and irradiated with 2, 6, 10 and 15 Gy dose respectively. The maximum energy of neutron beam is 50. SMev, an average of 24M