加速器质谱(AMS)测量中~(41)Ca标准样品的制备

Reference Samples Preparation of ~(41)Ca in AMS Measurement

摘要: 简要介绍加速器质谱 ( MAS)测量样品采用 Ca H2 以排除 4 1K的干扰。其制备主要包括两步 :首先是Ca O与过量的 Zr粉混合 ,在高温下还原出金属钙 ,然后金属钙与氢气在密闭容器中加热反应生成 Ca H2 。从金属钙到 Ca H2 的转换效率大于 90 %。

Abstract: In order to eliminate the isobaric interference of 41K in the AMS measurement, the sample has to be in form of CaH 2. CaH 2 is produced in a two-step reduction process. First,CaO is converted into calcium metal by vacuum distillation from a heated mixture of CaO and excessive Zr powder. Then the calcium metal is transferred to a second system and heated in the presence of hydrogen gas to form CaH 2. The conversion efficiency of Ca metal to CaH 2 is larger than 90%.