锇—锇测年方法研究

Study on Os-Os Dating Method

摘要: 采用负离子热电离质谱和等离子体质谱（ＩＣＰ－ＭＳ）技术建立了＾１８７Ｏｓ－＾１８６Ｏｓ和＾１８７Ｏｓ－＾１８８Ｏｓ测年方法。方法基于利用核反应＾１８５Ｒｅ（ｎ，γ）＾Ｒｅ和＾１８７Ｒｅ（ｎ，γ）＾Ｒｅ所产生的＾１８６Ｒｅ和＾１８８Ｒｅ分别经过β衰变生成稳定同位素＾１８６Ｏｓ和＾１８８Ｏｓ。＾１８６Ｏｓ和＾１８８Ｏｓ的生成量由照射参数和样品中Ｒｅ含量决定。只要测定Ｏｓ同位素比值就可计算出Ｒｅ含量和Ｏ

Abstract: A Recontaining sample is irradiated with thermal neutron in a nuclear reactior. The following reactions occur with high cross sections: 185Re(n,)186Re and 187Re(n,)188Re. Both 186Re and 188Re decay to 186Os and 188Os stable isotopes. The 186Os and 188Os y