中文摘要：

先引入随时间t变化的星系中子辐照量分布函数gρal（t,τ）描述各演化阶段星系s-过程核素丰度的分布规律.利用星系化学演化的三成分模型导出星系中子辐照量分布函数的演化方程,从而建立星系的中子辐照量分布函数gρal（t,τ）与AGB星的中子辐照量分布函数ρAGB（τ）之间的关系.取AGB星中子辐照量为指数分布,当取t=t⊙时,得到了太阳系的中子辐照量分布Sρun（τ）.

英文摘要：

The author introduce a new concept,the distribution function of neutron exposures in the Galaxy ρgal（t,τ）,to study the chemical evolution characteristics of the Galaxy for s-process nuclei.Using the three component model for the chemical evolution of the Galaxy,we get the evolution functions of ρgal（t,τ） which include the distribution function of neutron exposures in the AGB stars ρAGB（τ）·At t=t☉,we adopt the ρAGB（τ） as exponential distribution and obtain the distribution function of neutron exposures in the solar system ρSun（τ）.