当可能有大量的放射性物质释入环境而对居民造成较大剂量的辐射时,只有通过采取防护措施来限制公众的照射。这些措施中,撤离是一种有效的,但同时伴有较大困难和风险的措施,因此对它进行专门的研究是十分必要的。本研究课题通过对我国两个核电厂周围大量有关资料的调查,初步摸索了符合国情 When a large amount of radioactive material may be released into the environment and cause a greater dose of radiation to residents, only public protection should be used to limit the exposure of the public. Among these measures, the withdrawal is an effective measure, accompanied by greater difficulties and risks, so it is necessary to conduct a special study on it. The subject of this research through surveying a large number of relevant data around the two nuclear power plants in our country,