近年来有关低水平辐射生物效应问题越来越引起人们的注意。广东高本底地区居民免疫学状态的研究结果提示低水平辐射对人体的防御机制可能有一定的刺激作用。我室的动物实验亦表明0.1Gy以下的单次X-射线全身照射对抗体形成有刺激作用。为使实验条件更接近于自然环境,我们又观察了低水平持续照射后PFC的变化,并探讨其可能的发生机制。 实验用~(60)Co-γ射线源照射C57BL/6纯系小鼠,剂量率为5.4mGy/(6h·d)。小鼠每周受照6天,累积 In recent years, the issue of low-level radiation biological effects has attracted more and more attention. The results of studies on the immunological status of residents in high background areas in Guangdong suggest that low-level radiation may have a certain stimulatory effect on the human defense mechanism. Animal experiments in our laboratory also showed that a single X-ray systemic irradiation below 0.1 Gy stimulated the formation of antibodies. In order to make the experimental conditions closer to the natural environment, we also observed changes in PFC after low-level continuous irradiation and discussed its possible mechanism. The experimental mice were irradiated with ~(60)Co-γ rays to C57BL/6 pure mice at a dose rate of 5.4 mGy/(6h·d). The mice were exposed for 6 days per week and accumulated