穿透力强对人体有害的高能x线和γ线等放射线，在较短时间内全身或身体大范围接受相当量的放射线照射时，称急性照射。急性照射可使机体器官发生障碍及中枢神经障碍等，严重时导致死亡，这种照射一是发生在医疗科研事故中，另一是发生在核战争中。急性照射可分为急性全身照射和急性局部照射。
辐射事故照射，除大剂量急性照射情况外，更多的还有受照延续时间不等、照射水平不一的多次受照情况，甚至尚有数天内连续受照的。
Besides acute exposure of large dose, there are repeated exposures mainly in which exposure duration is unequal and dose levels heterogeneous, even exposure may continue for a couple of days.
目的比较不同照射野或不同剂量分割放疗鼻咽癌的急性放射反应及后遗症。
Objective To compare the acute radiation reactions and sequelae with different radiation fields and different modes of fractionated radiotherapy for nasopharyngeal carcinoma.
方法实验动物均选用SPF级C57 BL小鼠，用不同药物和不同照射剂量处理后，建立急性放射损伤模型。
Methods to establish acute radiation damage pattern, C57BL mice in SPF grade were divided into different groups by different ways and irradiation doses.
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