目的 :观察低剂量电离辐射对组织器官所致的形态学变化。方法 :用 2 5cGYr射线一次照射兔眼及胃等部位 ,光学显微镜及透射电镜 (TEM)观察眼晶状体、视网膜及胃粘膜的组织形态学变化。结果 :光学显微镜及TEM观察眼晶状体早期即有明显的形态学改变 ,而胃粘膜的组织形态学变化则出现于受照射十二个月以后。结论 :低剂量电离辐射能导致组织器官的形态学改变。但不同器官所表现出的形态学变化与受照射后的时间长短有密切关系。 Objective: To observe the morphological changes of tissues and organs caused by low dose ionizing radiation. Methods: Histopathological changes of the lens, retina and gastric mucosa were observed by light microscope and transmission electron microscope (TEM). Results: Optical microscope and TEM showed significant morphological changes in the early lens of the eye, while histological changes of the gastric mucosa occurred after irradiation for 12 months. Conclusions: Low doses of ionizing radiation can cause morphological changes in tissues and organs. However, the morphological changes exhibited by different organs are closely related to the length of time after irradiation.